Reuse the existing builtin and extension infrastructure to provide a
garbage collection mechanism that allows for asynchronous execution.

On --expose-gc, this changes the gc call to parse parameters the
following:
(1) Parse options when encountering an options object with known properties.
(2) No parameters is parsed as
    {type: 'major', execution: 'sync'}.
(3) Truthy parameter that is not setting options is parsed as
    {type: 'minor', execution: 'sync'}.

(2) and (3) preserve backwards compatibility for existing callers as this may be
used widely across various test and benchmarking infrastructures.

Valid options:
- type: 'major' or 'minor' for full GC and Scavenge, respectively.
- execution: 'sync' or 'async' for synchronous and asynchronous
  execution respectively.

Returns a Promise that resolves when GC is done when asynchronous execution
is requested, and undefined otherwise.

Note: This is implemented as builtin to avoid having any stack at all. This
information is also passed to the embedder to allow skipping stack scanning.

Change-Id: Ie5c9b6f0d55238abfeb9051ffa1837501d474934
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1793143
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63659}