[lib] Return mediaID updates from useSendMultimediaMessage

Summary:
Follow up https://phab.comm.dev/D13501?id=44638#inline-77322
Modified hook return type to also return media ID updates

Depends on D13501

Test Plan: Flow

Reviewers: kamil, ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13555