Group classification type (#2030)

Author: Tim-Kerr

libs/labelbox/src/labelbox/schema/tool_building/classification.py

@@ -53,6 +53,7 @@ class Type(Enum):
         TEXT = "text"
         CHECKLIST = "checklist"
         RADIO = "radio"
+        GROUP = "group"
 
     class Scope(Enum):
         GLOBAL = "global"