Expose SoundTriggerManager apis as SystemApi

-Expose RecognitionConfig as SystemApi.

API-Coverage-Bug:342000018

Bug: 339267254
Flag: android.media.soundtrigger.manager_api
Test: Successfully load the generic sound model and verify
      sound trigger event could be triggered correctly on
      Pixel Watch devices.
Change-Id: I5a55638fd492688d19f9a3f7c27581e5b7724e0d