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
I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/uld_YkbzL0Q/m/L7VjjNTDAQAJ
Design Doc: https://docs.google.com/document/d/17hQz4nOC7PJYhxc_MU-BRoT6BnYGZv66XlU1iGX0ywQ
LGTM1:bratell.d@gmail.com
LGTM2:chrishtr@chromium.org
LGTM3:tkent@chromium.org

Bug: v8:11637
Change-Id: I555c5425ff5ee5854a43608aa56ee5399651408a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3087976Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76330}