Enable the `unsafe-op-in-unsafe-fn` lint (#10559)

* Enable the `unsafe-op-in-unsafe-fn` lint

This commit enables the `unsafe-op-in-unsafe-fn` lint in rustc for the
entire workspace. This lint will

Enable the `unsafe-op-in-unsafe-fn` lint (#10559)

* Enable the `unsafe-op-in-unsafe-fn` lint

This commit enables the `unsafe-op-in-unsafe-fn` lint in rustc for the
entire workspace. This lint will be warn-by-default in the 2024 edition
so this is intended to smooth the future migration to the new edition.

Many `unsafe` blocks were added in places the lint warned about, with
two major exceptions. The `wasmtime` and `wasmtime-c-api` crates simply
expect this lint to fire and effectively disable the lint. They're too
big at this time to do through this PR. My hope is that one day in the
future they'll be migrated, but more realistically that probably won't
happen so these crates just won't benefit from this lint.

* Fix nostd fiber build

prtest:full

* Fix build on Windows

* Fix asan build

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add wasmtime-wasi-io and custom async executor to min-platform example (#10128)

* add wasmtime-wasi-io and custom async executor to min-platform example

* make it possible to find example from wasm

add wasmtime-wasi-io and custom async executor to min-platform example (#10128)

* add wasmtime-wasi-io and custom async executor to min-platform example

* make it possible to find example from wasmtime-wasi-io docs

prtest:full

* fix comment

* add wasm32-wasip2 target for min-platform ci

and enable signals based traps when running with wasi disabled,
because at the moment without signals based traps no native code can be
loaded so the embedding never actually executes wasm. this ensures the
heap size setting when not(feature = "wasi") is checked by execution

* fix cbindgen version in ci

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Use `&raw` from Rust 1.82 (#9960)

This commit leverages #9956 to use the `&raw` syntax for creating raw
pointers instead of using the `ptr::addr_of!` macro.

Update MSRV to 1.81.0 (#9692)

* Update MSRV to 1.81.0

Coupled with today's release of Rust 1.83 this bumps our MSRV on
Wasmtime to 1.81. This also updates the nightly used for testing too.

prtest:

Update MSRV to 1.81.0 (#9692)

* Update MSRV to 1.81.0

Coupled with today's release of Rust 1.83 this bumps our MSRV on
Wasmtime to 1.81. This also updates the nightly used for testing too.

prtest:full

* Propagate some necessary features through Winch

* Remove std feature from adapter configuration

Looks to be historical at this point and is no longer needed

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Add a `signals-based-traps` Cargo compile-time feature (#9614)

* Gate signal handlers behind a new Cargo feature

This commit adds a new on-by-default Cargo feature to the `wasmtime`
crate named `si

Add a `signals-based-traps` Cargo compile-time feature (#9614)

* Gate signal handlers behind a new Cargo feature

This commit adds a new on-by-default Cargo feature to the `wasmtime`
crate named `signals-based-traps`. This is modeled after the
`Config::signals_based_traps` configuration at runtime and can be used
to statically disable the use of signal handlers in Wasmtime. This
notably reduces the number of platform dependencies that Wasmtime has
and provides a mode of avoiding relying on signals altogether.

This introduces a new `MallocMemory` which is a linear memory backed by
the system allocator. This new type of memory is enabled when virtual
memory guards are disabled and signals-based-traps are disabled. This
means that this new type of memory will be candidate for fuzzing for
example.

prtest:full

* Fix rebase conflict

* Refactor `MmapVec` documentation and representation

* Remove no-longer-needed `Arc`
* Document it may be backed by `Vec<u8>`

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Update documentation and example for no_std (#8555)

* Update Wasmtime's tier stability documentation

Move some items between tiers and add a few misc items here and there.

* Update platform suppor

Update documentation and example for no_std (#8555)

* Update Wasmtime's tier stability documentation

Move some items between tiers and add a few misc items here and there.

* Update platform support documentation

Re-word lots of this since it was originally written, link to the tiers
of support page, and rewrite the section on `no_std`.

* Update the `min-platform` example with no_std

This commit updates the preexisting `min-platform` example to no longer
require Nightly Rust and instead use the `no_std` support now added to
Wasmtime. This involved:

* Change the build process to produce a staticlib which is then manually
converted via `cc` into a shared library for the native Linux platform.
* Compile the modules outside of the embedding and only `deserialize`
within the embedding.
* Update the `indexmap` dependency to pick up a bug fix required in
`no_std` mode (apparently, it fails on [email protected] and passes at
2.2.6, I didn't dig much further).

This commit additionally makes the `wasmtime-platform.h` header file
generated by the example a release artifact for Wasmtime itself. The
header itself is touched up a bit by configuring some more `cbindgen`
options as well.

* Fix clippy build

prtest:full

* Review comments

* Pass gc-sections to linking the library

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Turn the `wasmtime-runtime` crate into the `wasmtime::runtime::vm` module (#8501)

* Expose `wasmtime-runtime` as `crate::runtime::vm` internally for the `wasmtime` crate

* Rewrite uses of `wasmtime

Turn the `wasmtime-runtime` crate into the `wasmtime::runtime::vm` module (#8501)

* Expose `wasmtime-runtime` as `crate::runtime::vm` internally for the `wasmtime` crate

* Rewrite uses of `wasmtime_runtime` to `crate::runtime::vm`

* Remove dep on `wasmtime-runtime` from `wasmtime-cli`

* Move the `wasmtime-runtime` crate into the `wasmtime::runtime::vm` module

* Update labeler for merged crates

* Fix `publish verify`

prtest:full

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Add a "custom" platform configuration for Wasmtime (#7995)

* Add a "custom" platform configuration for Wasmtime

This commit leverages adds a new "platform" to Wasmtime to be supported
in the `crate

Add a "custom" platform configuration for Wasmtime (#7995)

* Add a "custom" platform configuration for Wasmtime

This commit leverages adds a new "platform" to Wasmtime to be supported
in the `crates/runtime/src/sys` folder. This joins preexisting platforms
such as Unix and Windows. The goal of this platform is to be an opt-in
way to build Wasmtime for targets that don't have a predefined way to
run.

The new "custom" platform requires `--cfg wasmtime_custom_platform` to
be passed to the Rust compiler, for example by using `RUSTFLAGS`. This
new platform bottoms out in a C API that is intended to be small and
Linux-like. The C API is effectively the interface to virtual memory
that Wasmtime requires. This C API is also available as a header file at
`examples/min-platform/embedding/wasmtime-platform.h` (generated by
`cbindgen`).

The main purpose of this is to make it easier to experiment with porting
Wasmtime to new platforms. By decoupling a platform implementation from
Wasmtime itself it should be possible to run these experiments
out-of-tree. An example of this I've been working on is getting
Wasmtime running on bare-metal with a custom kernel. This support
enables defining the platform interface of the custom kernel's syscalls
outside of Wasmtime.

* Exclude wasmtime-platform.h from formatting

* Include build-wasmtime-target-wasm32 in final job

* Don't force any single toolchain

* Add notes to no_std docs

* Add rust-src to CI

* Review comments

* Change APIs to be fallible

* Only compile the min-platform example on Linux

* Fix compile of min-platform example

* Fix another compile error in the example

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