Add WebDXFeature use counter for Intl.Segmenter

This adds a mapping of existing WebFeature use counters into a new
WebDXFeature use counter.

This is an effort to add new telemetry counters to features shipped since 2020.

Bug: 366475997
Change-Id: Icfe4fa49c40a8280e49df6699d2237a634f89d80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5891910
Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Daniel Smith <danielrsmith@google.com>
Cr-Commit-Position: refs/heads/main@{#1369701}