Stage 3 proposal
Spec: https://tc39.es/intl-displaynames-v2/
R2T: https://groups.google.com/a/chromium.org/g/blink-dev/c/XOJE7zVlxnI/m/cnkuazxHAwAJ
Design Doc: https://docs.google.com/document/d/17hQz4nOC7PJYhxc_MU-BRoT6BnYGZv66XlU1iGX0ywQ

Bug: v8:11637
Change-Id: I6183f53bd7c3eae174c306debf0779a5be051d29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2952040Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75089}