OpenGL backend: implement deferred GL calls

If the gl_defer toggle is enabled, defer all GL calls by capturing them
in a lambda for later execution, via Quyen's EnqueueGL() infrastructure.

For destruction, implement a templated EnqueueDestroyGL(). If called
from the destructor, this will get the object's handle immediately and
capture that for destruction, or pass the object handle getter to the
deferred lambda in case the object creation has also been deferred and
the handle is not yet known. The DestroyImpl()'s DestroyReason is used
to know which codepath to take.

Enable Buffer, Copy, and TextureZeroInit tests with gl_defer on. Enable
most Multithread tests with both gl_defer and
gl_allow_context_on_multi_threads passes. Multithreaded mapping tests
are not enabled on GL, since they are exhibiting some flake and may be
exposing a race.

Bug: 451928481
Change-Id: I24fa1d8ca885a6bfbb6abefa22dc9cac2733c4e0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/281095
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Quyen Le <lehoangquyen@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>