[vm/concurrency] Add locking to ApiState as preparation for multiple isolates using the same api state Once multiple isolates share one heap we'll start sharing the set of weak/persistent handles present in the ApiState. This is split out of the shared heap cl to make it smaller. Issue https://github.com/dart-lang/sdk/issues/36097 Change-Id: I3b8eb1ebd9361ff56f5272042ae002f57fa61ddd Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135308 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
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