Introduce ParkedMutexGuard which is similar to base::MutexGuard but also
parks the LocalHeap while the thread is blocked.

Bug: v8:10315
Change-Id: I149673511df013881ed2fbb42cf22d3f9b17b92d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230518
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68173}