Asynchronous WebAssembly compilation returns the compilation result
through resolving a result promise. So far the result promise was
resolved through V8-internal APIs. This caused problems, because
resolving promises requires correct handling of microtasks, and
microtasks are controlled by the embedder, and not by V8.

This CL adds an API to allow the embedder to resolve the result
promise itself, and handle microtasks as necessary.

The use of the new API is available in a full CL, without API dance:
https://chromium-review.googlesource.com/c/v8/v8/+/3694975

R=cbruni@chromium.org

Bug: v8:12953
Change-Id: Ie9a56041f2d3e0c46664f1938e995f1e2c22f981
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3695584Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81141}