Support RC API endpoint groups.create param extraData

The extraData param allows setting arbitrary attributes on the RC Room.
Added to the API in RC v3.12.0 by Rocket.Chat PR 20617, commit 2ad2d0bd7ed

Author: nmagedman

lib/rocket_chat/messages/room.rb

@@ -309,7 +309,7 @@ def members(room_id: nil, name: nil, offset: nil, count: nil, sort: nil)
       attr_reader :session
 
       def room_option_hash(options)
-        args = [options, :members, :read_only, :custom_fields]
+        args = [options, :members, :read_only, :custom_fields, :extra_data]
 
         options = Util.slice_hash(*args)
         return {} if options.empty?