[lint] Upgrade to Prettier v3, typescript-eslint to v6 (#23544)

Why
---
Prettier 3 is out. Add support for it with this linter config.

**Note for reviewer:** the first commit is the one with th

[lint] Upgrade to Prettier v3, typescript-eslint to v6 (#23544)

Why
---
Prettier 3 is out. Add support for it with this linter config.

**Note for reviewer:** the first commit is the one with the actual
changes. The rest of this PR are changes to get the linter passing
(mostly autofix).

How
---
Update eslint-config-prettier and eslint-plugin-prettier. To address
deprecation warnings, also update typescript-eslint/parser and
typescript-eslint/eslint-plugin.
Because of an update to typescript-eslint/parser, we need to suppress
deprecation warnings (documented in a comment).

Regenerated test snapshots. Due to the upgraded dependencies, typecasts
and optional chaining are now auto-fixable by lint. This converts
warnings into autofixes.

Test Plan
---
`yarn test` in the linter config. Run `expotools check --all --fix-lint
--no-build --no-test --no-uniformity-check` to try this config on the
whole repo.

---------

Co-authored-by: Expo Bot <[email protected]>

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migrate expo-router to expo/expo (#23725)

# Why

Migrate expo-router to expo/expo from expo/router so we can version it
with the Expo SDK. Also required for further integration with Expo CLI,
ex

migrate expo-router to expo/expo (#23725)

# Why

Migrate expo-router to expo/expo from expo/router so we can version it
with the Expo SDK. Also required for further integration with Expo CLI,
expo-font, expo-image, etc.

# How

- Migrate `expo-router`, and `@expo/metro-runtime`.
- Fold `expo-head` into `expo-router`.
- Integrate in `apps/sandbox` for low-stakes testing. Another PR can
pull in.

# Test Plan

- `apps/sandbox` starts on all platforms and pulls from expo-router in
the `packages` directory.
<!--
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reproduce your test, especially if this PR does not include automated
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# Checklist

<!--
Please check the appropriate items below if they apply to your diff.
This is required for changes to Expo modules.
-->

- [ ] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [ ] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [ ] This diff will work correctly for `npx expo prebuild` & EAS Build
(eg: updated a module plugin).

---------

Co-authored-by: Expo Bot <[email protected]>

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