Use the new storage feature for the CollaborationCursor extension

[hanspagel]

Add a storage

• This PR introduces the new storage feature in the CollaborationCursor extension.

Before we’ve used an onUsers callback function to get the current list of other users out of the editor. Now we just provide an array that’s easily accessible and reactive (in Vue + React).

Before:

CollaborationCursor.configure({
  provider,
  onUpdate: users => {
    this.users = users
  },
})

After:

CollaborationCursor.configure({
  provider,
})

And access the current list of users:

editor.storage.collaborationCursor.users

Rename the user command to updateUser

• I’ve deprecated the user command and renamed it to updateUser which fits the current naming scheme better.

Remove redundant code

• I’ve removed some redundant code as mentioned in CollaborationCursor status event redundant? #2079.

Additional updates

• Updated the docs
• Marked old code as deprecated and adding warnings to the console
• Updated all examples to use the new code

Feedback appreciated!