Add extra_args to modules meta-schema.json (#7783)

add extra_args to modules meta-schema.json

Author: mirpedrol

modules/meta-schema.json

@@ -34,6 +34,19 @@
                 "type": "string"
             }
         },
+        "extra_args": {
+            "type": "array",
+            "description": "Extra arguments for the module",
+            "items": {
+                "type" : "object",
+                "properties": {
+                    "description": {
+                        "type": "string",
+                        "description": "Description of the argument"
+                    }
+                }
+            }
+        },
         "input": {
             "type": "array",
             "description": "Input channels for the module",