[shared storage] Record usage for when addModule() is called with cross-origin script

Why: We proposed a potentially breaking change to addModule() in
https://github.com/WICG/shared-storage/pull/158. That is, currently,
a website can call addModule() everywhere and expect it to fail when
they're not in their own context; however, with cross-origin script
support, these calls could unexpectedly succeed.

Thus, we track potentially non-forward-compatible addModule() usages to
assess the potential impact and guide further decisions. We anticipate
this usage to be low.

Bug: 350764023
Change-Id: I5da4583ed583baa398bdb2cadf8955d341474050
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5665746
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: Sun Yueru <yrsun@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1322541}