Change Details

Part of [[ https://linear.app/comm/issue/ENG-6713/split-native-rust-library-librs-into-smaller-files | ENG-6713 ]]. - Created a base module for Identity Service and moved first APIs there. - Followed the convention from Backup module having the `ffi` submodule and further submodule tree Depends on D11516

Part of [[ https://linear.app/comm/issue/ENG-6713/split-native-rust-library-librs-into-smaller-files | ENG-6713 ]]. - Created a base module for Identity Service and moved existing modules to its submodules Depends on D11516

Part of [[ https://linear.app/comm/issue/ENG-6713/split-native-rust-library-librs-into-smaller-files | ENG-6713 ]]. - Created a base module for Identity Service and moved first APIs there. - Followed the convention from Backupexisting module having the `ffi` submodule and furthers to its submodule treees Depends on D11516