feat: refactor quest models

+ separate stage and exception
+ reuse commandResponder

packages/models/exception.js

@@ -0,0 +1,8 @@
+import { Schema } from 'mongoose'
+import commandResponderSchema from './commandResponder.js'
+
+const exceptionSchema = new Schema({})
+
+exceptionSchema.add(commandResponderSchema)
+
+export default exceptionSchema