Create attention listener for VisualQueryDetection

Attention listeners are created with registration methods such that
SysUI can register to receive the callbacks signals fired from the
isolated VisualQueryDetectionService.

Bug: 264557373
Test: CtsVoiceInteractionTestCases
Change-Id: I81268f3f01a681dec3c35824bfe06704bc17d5f8
7 files changed