[shared] add new interceptor to identity gRPC clients

Summary: adding a new interceptor to both gRPC clients that inserts code version and device type into the request metadata. we'll eventually need this to tell clients to upgrade to a version that supports device lists

Test Plan:
inspected the request metadata on the identity service side and confirmed that code version and device type appeared

Depends on D9441

Reviewers: bartek, jon

Reviewed By: bartek

Subscribers: michal, ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9448