Add controller for roleSchemas (unfinished)

+ Refine error messages for role schemas
+ Add role schema routes
+ Add RESULT_SCHEMA DataType
+ Add SchemaError.isSchemaError() type guard

src/Middleware/error/SchemaError.ts

@@ -6,4 +6,8 @@ export default class SchemaError extends ForwardableError {
   constructor(message: string) {
     super(400, message);
   }
+
+  public static isSchemaError(err: any): err is SchemaError {
+    return err.__oid === "SCHEMA_ERROR";
+  }
 }