[identity] Add function to get device list history

Summary:
Part of ENG-5049. Adds a function that queries all device list updates since given timestamp, or all updates ever if no timestamp is given.

Depends on D10246

Test Plan:
Added three updates with to DDB.

• Without timestamp, all three are returned.
• Given timestamp T, where U1 < T < U2 < U3, the function returned U2 and U3.
• Empty list is returned if timestamp is after all updates.
• Empty list is returned if the user has no device lists yet.

Reviewers: varun, michal

Reviewed By: varun

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10247