* FEATURE: Log tag group changes in staff action log
This commit records every change (add, change, delete) to a tag group in
the staff action log.
It uses a modal that was originally called ThemeChangeModal to display
changes, allowing staffs to see the specific changes clearly. The modal
is renamed to StaffActionLogChangeModal in this PR.
ref: https://meta.discourse.org/t/-/325011/14
Co-authored-by: Keegan George <kgeorge13@gmail.com>
