WearableSensing framework API for wearables.

WearableSensing framework APIs are intended to be used to interact and
manage the WearableSensingService. The WearableSensingService provides
an isolated service environment for an application to provide a remote
data stream to and run sensing workloads on the data stream. Clients
that want to use this API must hold the permission
MANAGE_WEARABLE_SENSING_SERVICE. The permission protection level is signature|privledged.

API overview: go/wearable-sensing-api
Design doc: go/trusted-glasses

A follow up CL will implement the integration between
WearableSensingService and AmbientContextManager. A subsequent follow up
will also add unit and cts testing.

Bug: 244181656, 249135378
Test: Builds.
Ignore-AOSP-First: to prevent new feature leak.
CTS-Coverage-Bug: 259453662
Change-Id: I0c5e3c5aa01dda9d3289733abd22abfcccc15f96