Implement getServiceComponentName API for Content Capture

Tests are in ag/5989968

Fixes: 121047489
Test: atest CtsContentCaptureServiceTestCases # to make sure nothing broke
Test: atest
CtsContentCaptureServiceTestCases:android.contentcaptureservice.cts.BlankActivityTest#testTargetServiceName_enabled
Test: google3 test with test app
Change-Id: I4f11a324beb938a28cd150c35bb3d83c77e59e0b
3 files changed