Add a SuggestionStrikeDatabase

This CL adds the class responsible for managing suggestion strike, and
also the feature where this functionality will be gated behind.

More info about the general goal of this CL chain can be found on
go/ac-off-false-positives

Bug: 322910752
Change-Id: Id0bee7f9e7272cecc43b57b177ed959d404aabb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5355864


Reviewed-by: Florian Leimgruber <fleimgruber@google.com>
Commit-Queue: Jihad Hanna <jihadghanna@google.com>
Cr-Commit-Position: refs/heads/main@{#1271473}