Support searching in the user directory for invite targets
Support searching in the user directory for invite targets

Part of https://github.com/vector-im/riot-web/issues/11200
matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk