Add concept of "paused" appOp (started, but MODE_IGNORED)

Ensure that we record historical ops for started, ingored ops, during
the time they are not set to ignored

Fixes: 185945831
Test: atest SensorPrivacyCameraTest,SensorPrivacyMicrophoneTest
Change-Id: Icd6febd8ec371848280178d0b3e053ab221d93ed