Add UMA use counter type for links with `interestfor`

This adds a new ContextMenuAndroidType that will be used for all
links that have the (experimental) `interestfor` attribute. This
set of counters can be used to track the frequency of interaction
with the "Show Details" menu item (related to `interestfor`) as
compared to the other menu items.

Bug: 326681249
Change-Id: I108e99f804f8f81e7754b98e33f7c34a27036b88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6785811
Reviewed-by: Sinan Sahin <sinansahin@google.com>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1494557}