Add SandboxedDetectionServiceBase interface

Added a common interface for both HotwordDetectionService and the
upcoming VisualQueryDectionService that handles baisc functionalities of
initializing the service. Also comes with several refactorization
renaming on relative javadoc to replace hotword detection context into a more general term sandboxed detection.

Bug: 261631429
Test: atest CtsVoiceInteractionTestCases
Change-Id: I1a76f223b14807d972764fbca38207350469ba53