This ship one method in Intl
Intl.supportedValuesOf which is a Stage 3 TC39 proposal

Design Doc: https://docs.google.com/document/d/1lbj_YVW-xhzYNMQeHB-qDjVkf4SA-eTHYpYXx3Oaud8
API Owner LGTMs: miketaylr@chromium.org, chrishtr@chromium.org, tkent@chromium.org

Spec: https://tc39.es/proposal-intl-enumeration/
https: //chromestatus.com/guide/edit/5649454590853120
I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/Txtf_rSqGH8/m/e27FY33JAQAJ
R2T: https://groups.google.com/a/chromium.org/g/blink-dev/c/IaTkvH_9DAY/m/1rDxe8lvAAAJ
I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/I0Y4FrRMNSY/m/XIN_fgA5DAAJ
Bug: v8:10743
Change-Id: I1e4c80e93ef903347a0e6da73b1e8514863bde09
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3315228Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78379}