Add getFutureForIntent

Add helper function which gets a future associated with an intent
broadcast matching a certain action and predicate.

Automatically unregister the listener when the future is completed or
cancelled.

Add unit tests.

Bug: 288333346
Bug: 294636572
Test: atest GetFutureForIntentTest
Change-Id: Ie26487d3f727691d001b3d0392dc0fcdf5b5a2db