Create a WatchedIntentFilter

Bug: 181964615

Create a WatchedIntentFilter class that wraps IntentFilter.  This
class is not used in this commit.

Note that a WatchedIntentFilter always owns its encapsulated IntentFilter.

Test: atest
 * FrameworksServicesTests:WatchedIntentHandlingTest

Change-Id: I366d5f63177a56c74ccdac254a8bf592b4c3c0ad