Addressing previous todo comments and feedback

- Rename all Trusted references to Sandboxed.
- Added method onDataAugmentRequest for allowing data retreival in the midst of inference.
- Adding API to provide service package name for remote impl
- Adding API to notify OnDeviceIntelligence on isolated process startup
- Moving token count in a container class with params
- Marking Content in processRequest* as @Nullable
- Adding callerUid field to service methods to allow validation/rate-limiting in the service impl


Test: make
Bug: 316589195
API-Coverage-Bug: 323147058
Change-Id: I51e71920f346dc966d158296530d61546fe3d25b