Create a data repository for device to cache device specific LiveData

This CL creates a new data repository class to be inherited by LiveDatas that need to be device aware.
The data repository uses deviceId as the last element in the composite key. If no deviceId provided, it
dfaults to primary device Id.

Bug: 292252664
Test: For the default device, verify existing tests pass. For remote devices, tests are in ag/24872025.
Change-Id: I3257a80ab9ac459aca79c6db11498bbaac90c196