[Feature] add permissions to collaborators

[ggg-codes]

Manage permissions for users in relay servers, roles such as visitor will have the read-only permission, and editor will have the read and write...

Why

Sometimes you want others to just view some notes and not edit, it will help in these cases to have it

[dtkav]

Thanks for the feature request -- we're already tracking this request (and have started work on some possible implementations).