Camera / UidObserver: Add the ability to subscribe to specific UIDs
UidObserver sends updates about the state of all packages installed on the system. In the case of the cameraserver, we only care about a handful of them. The current status quo is to filter out these callbacks but there is a significant IPC cost that is not addressed by that approach. This patch adds new entrypoints to ActivityManagerService to listen only to specified UIDs. This set of uids can be updated dynamically. Change-Id: Ic699526588a3f9157ca7d38b905f898876d86847 Bug: 274486653 Test: -- on physical device: -- testCamera2AccessCallbackInSplitMode x10 -- ActivityManagerServiceTest -- ActivityManagerProcessStateTest -- ActivityManagerFgsBgStartTest -- UidObserverControllerTest -- Alternate focus in split screen between Camera2 + GCA x20
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