[native] expose farcaster id param to native identity service context provider

Summary:
Rust, C++ and js changes to add farcaster id param to the register methods in the native IdentityServiceContextProvider

Depends on D11396

Test Plan: called the js method and successfully registered an account with a farcaster ID. verified result in DDB.

Reviewers: ashoat, bartek

Reviewed By: ashoat, bartek

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D11398