Also add AOs: TimeZoneEquals

Spec Text:
https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.compare
https://tc39.es/proposal-temporal/#sec-temporal.zoneddatetime.prototype.equals
https://tc39.es/proposal-temporal/#sec-temporal-timezoneequals

Bug: v8:11544
Change-Id: Ibcd1e42d72f86f16e0f5ddb1fd589bbe7ab2225c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3709217
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81227}