Add comprehensive tests for role middleware and fix package dependencies

node_modules/mysql2/typings/mysql/lib/PoolConnection.d.ts

@@ -0,0 +1,11 @@
+import { Connection } from './Connection.js';
+import { Pool as PromisePool } from '../../../promise.js';
+
+declare class PoolConnection extends Connection {
+  connection: Connection;
+  release(): void;
+  [Symbol.dispose](): void;
+  promise(promiseImpl?: PromiseConstructor): PromisePool;
+}
+
+export { PoolConnection };