Minimize writes when reading app op events

We write the app op events from cache to database
to simplify and support versatile sql queries.

This change will minimize writes to the database
by only writing records for reqeusted app ops. This
helps in optimizing storage as we avoid writing
duplicate/premature app op events to storage.

Bug: 377584611
Flag: EXEMPT bug fix
Test: run all appops test locally via atest
Change-Id: I58467a3072690434e288ca598a552351b6a906ca