Add detection_service_paused_resumed_api flag.

The flag is used to control adding onRecognitionPaused and
onRecognitionResumed apis to SoundTriggerDetectionService.

Bug: 392968319
Flag: android.media.soundtrigger.detection_service_paused_resumed_api
Test: Build image for Pixel Watch devices.
Change-Id: Ib0aab89c5b22bf9fb57d14068538a86b77850b99