feat(error.ts): add new error handling functions for GraphQL errors

- Implement throwGraphQLError function to throw a new GraphQLError with custom message, code, and status
- Implement throwActionStateError function to throw a specific GraphQLError when an action state is not found

src/errors/error.ts

@@ -0,0 +1,16 @@
+import { GraphQLError } from 'graphql';
+
+export { throwGraphQLError, throwActionStateError };
+
+function throwGraphQLError(message: string, code?: string, status?: number) {
+  throw new GraphQLError(message, {
+    extensions: {
+      code,
+      status,
+    },
+  });
+}
+
+function throwActionStateError(message: string) {
+  throwGraphQLError(message, 'ACTION_STATE_NOT_FOUND', 400);
+}