[lib] Function to dispatch edit message action

Summary: Added function to dispatch edit message action. It calls the edit message function, which communicates with the keyserver endpoint.

Test Plan: Called the function from both web and native (iOS), and checked if the keyserver endpoint is called successfully.

Reviewers: michal, inka, ginsu, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7143