More Bluetooth API annotation updates.

This change adds a "BluetoothPermissionChecker" that ensures that
all Bluetooth permission annotations are consistent.  In addition, it
verifies that all Bluetooth public APIs have been audited to be
permission protected where relevant.

We've currently standardized on saying that APIs that return device
or Bluetooth state information (without sharing details about any
particular remote Bluetooth device) do not need to be permission
protected.

This change is only annotations and has no behavior changes.

Bug: 183626724
Test: ./build/soong/soong_ui.bash --make-mode Bluetooth RUN_ERROR_PRONE=true
Change-Id: Ie80b15b058359bf1e9a6ee881b89cb3e5b584ca1