Add a new cmd to wait for a specific broadcast to be dispatched.

Using the new option will allow clients to wait until all the
non-deferred broadcasts that are matching the specified intent
are dispatcted.

Bug: 279116343
Test: atest FrameworksMockingServicesTests:BroadcastQueueTest
Test: atest FrameworksMockingServicesTests:BroadcastQueueModernImplTest
Change-Id: Idedea6e5d755477874a85eebb1c222339e8e07dd