Spec Text:
https://tc39.es/proposal-temporal/#sec-temporal.duration.prototype.tolocalestring

This does NOT implement the intl version of toLocale in (noteice 'sup'
vs 'sec' after #)
https://tc39.es/proposal-temporal/#sup-temporal.duration.prototype.tolocalestring
since the details is not specified yet.

Bug: v8:11544
Change-Id: I7f5a2e9766005d1a7f6409d428ca53b5a38a3960
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3696482Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81167}