Rotate group keys after password change

[taoeffect]

Problem

If a user changes their password, their old keys can still be used to decrypt future group and chat events (if those haven't been rotated).

Solution

Rotate the group and chatroom keys for the groups and chats that the user is part of when they change their password.

Make sure the logic in 'gi.actions/group/shareNewKeys' (and the chat version) isn't affected (and update if so).

Also verify the other devices are logged out upon password change, and perhaps it might be a good idea to also delete old state on those devices too so that private keys to the old CEK etc can't be grabbed.