Add deriveHelper to semanticTokenTypes section of package.json

Author: Veykril

editors/code/package.json

@@ -1493,6 +1493,11 @@
                 "description": "Style for derives",
                 "superType": "attribute"
             },
+            {
+                "id": "deriveHelper",
+                "description": "Style for derive helpers",
+                "superType": "attribute"
+            },
             {
                 "id": "dot",
                 "description": "Style for .",