Fix potential OOM caused by DataProcessManager

The AsyncTasks started in DataProcessManager are not cancelled when
fragment is closed. Introduce helper class LifecycleAwareAsyncTask to
cancel AsyncTask automatically when lifecycle is stopped.

Bug: 384473507
Flag: EXEMPT bug fix
Test: Unit test & open/close battery usage screen 1000 times
Change-Id: I060f559fa85cc5feb9a42cb8dcc0581782a91d09