Changes to support reducing noise in active unlock notifications.

1. Add additional trigger onUserMayRequestUnlock
  - point existing trigger points from SystemUI to this
2. Argument added to onUserRequestedUnlock to indicate if user wants to
   dismiss keyguard.
3. Callback for result of grantTrust calls.
  - curently only calls back if device was unlocked as a result of the
    call

See design: go/au-noise-reduction

Note: changes made to SystemUI are manually tested and may need
refactoring which is being skipped now to meet the API Freeze deadline.

Bug: 225231929
Test: atest TrustTests
Test: Manual interaction with wake & fingerprint sensor
CTS-Coverage-Bug: 213944235
Change-Id: I8d08229f09c9a1f2295b7eb464d12cad0c6b8303