API feedback: TranslationCapability APIs refinement.

- updates APIs naming and uses Consumer<TranslationCapability>
  instead of PendingIntent
- Implements the propagating capability updates in the client side

Bug: 176208267
Test: manual.
Test: atest CtsTranslationTestCases

Change-Id: I171c908b529e2ef300e4bbd55c1565b33a25c1e5