[native] Change EditState to store messageInfo instead of only id

Summary:
Updated to provide messageInfo for next diff.
We need not only the id of the message but also its content. Now, we store the full messageInfo of the edited message.

Test Plan: Checked if the app still works as expected after the changes.

Reviewers: michal, inka, ginsu, tomek

Reviewed By: tomek

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7414