btaa: introduce activity attribution Java service

Introduce the Java portion of the new Activity Attribution (BTAA)
serviceand its JNI interface.

Tag: #feature
Bug: 172501038
Test: atest BluetoothInstrumentationTests:com.android.bluetooth.\
btservice.activityattribution

Change-Id: If31316a887125631f9abc52875a12cb8ae86391d