Invoke provideDataStream callback on WearableSensingService death.

Keeps track of the statusCallback provided by the client to the
WearableSensingManager in provideDataStream and invokes it with
STATUS_SERVICE_UNAVAILABLE when the remote WearableSensingService dies.

We do not need to call the provideConnection or
provideConcurrentConnection callbacks on binder death because they are
invoked with STATUS_CHANNEL_ERROR when the WearableSensingService dies.

Tested with CTS tests in ag/35512608 and locally by killing the
WearableSensingService process with ADB and verifying that the callback
was invoked with STATUS_SERVICE_UNAVAILABLE.

Change-Id: I8a7677714c0371f0cd754e4c589c11b14397b2c7
Bug: 441336476
Flag: EXEMPT BUGFIX