[lldb] Add a log dump command

Add a log dump command to dump logs to a file. This only works for
channels that have a log handler associated that supports dumping. For
now that's limited to the circ

[lldb] Add a log dump command

Add a log dump command to dump logs to a file. This only works for
channels that have a log handler associated that supports dumping. For
now that's limited to the circular log handler, but more could be added
in the future.

Differential revision: https://reviews.llvm.org/D128557

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[lldb] Make thread safety the responsibility of the log handlers

Drop the thread-safe flag and make the locking strategy the
responsibility of the individual log handler.

Previously we got away wit

[lldb] Make thread safety the responsibility of the log handlers

Drop the thread-safe flag and make the locking strategy the
responsibility of the individual log handler.

Previously we got away with a non-thread safe mode because we were using
unbuffered streams that rely on the underlying syscalls/OS for
synchronization. With the introduction of log handlers, we can have
arbitrary logic involved in writing out the logs. With this patch the
log handlers can pick the most appropriate locking strategy for their
particular implementation.

Differential revision: https://reviews.llvm.org/D127922

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