[identity][protos] Add RPC to update PlatformDetails

Summary:
Addresses ENG-8280.
This RPC is going to be called when client has been updated.

No inputs or outputs are needed - all required data is sent in gRPC metadata.

Depends on D12273

Test Plan:
Patched native_rust_library to pass custom code version value, instead of CODE_VERSION constant. After each of the following actions,
verified DDB for code version changes:

• Called other RPCs (important: for already existing devices)- no change
• Called SyncPlatformDetails RPC - the value was updated

Reviewers: ashoat, marcin, varun

Reviewed By: marcin

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D12274