[web] Create failed send modal
Test Plan: Call setModal(<FailedSendModal setModal={props.setModal} />) and check if it was displayed correctly and if clicking close button closes the modal.
Reviewers: ashoat
Reviewed By: ashoat
Subscribers: KatPo, zrebcu411, Adrian, atul, subnub, karol-bisztyga
Differential Revision: https://phabricator.ashoat.com/D739