Add an upper limit for appops database size

The upper limit is set to 50MB, and least recent
records will be trimmed to keep database size
below 50MB.

We are deleting at least 1024 records after
considering max batch size of insertion.

Bug: 418075370
Test: presubmit
Test: manual
Flag: android.permission.flags.enable_all_sqlite_appops_accesses
Change-Id: Icf43d2ec69b1e7e8a125569161aad0ed76b68fdc