[native] add logOut to CommRustModule

Summary: rust + JSI code to call identity service log out RPC from native client

Test Plan: called commRustModule.logOut() successfully with credentials from local DDB. confirmed the CSAT and device were removed from DDB

Reviewers: bartek

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11334