Expose syncing platform details to identity client context

Summary: This differential exposes syncing platform details to identity client context

Test Plan: Repeat test plan from parent diff but this time on both web and native and instead of calling Rust, call identity service client from context.

Reviewers: kamil, bartek

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12311