This updates node typings in MicrotaskQueue builtins including:
 - Use RawPtrT instead of IntPtrT for pointers.
 - Prefer CAST instead of UncheckedCast where possible.
 - Fix MachineType / MachineRepresentation values there.

Bug: v8:8124
Change-Id: Idb02ac3ae51d2e9d45920115955afb68c81c7794
Reviewed-on: https://chromium-review.googlesource.com/c/1375510
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58300}