BluetoothMetricid: Add metric allocator api in java

Bug: 142563377
Test: Manual atest AdapterServiceTest

Change-Id: I65499313fd7dac7390faec5620255c553884937a
Merged-In: I65499313fd7dac7390faec5620255c553884937a
(cherry picked from commit d90fd242c8dea9e60ba0ba2dc353f1195359ea4f)
3 files changed