feat: enhance query handling with modules and plugins

- Added ManyToMany relationship for plugins in Query entity.
- Updated QueryExecuterController to accept structured query data.
- Enhanced QueryExecuterService to support plugin initialization and execution.
- Implemented QueryHandlerService methods for creating and updating queries, modules, and plugins.
- Introduced new endpoints for creating and adding modules and plugins to queries.
- Created Plugin base class and DatabasePlugin implementation for database interactions.
- Updated VM class to integrate plugin functionality during script execution.
- Added test cases for project, query, module, and plugin operations.

src/vm/plugins/database.plugin.ts

@@ -0,0 +1,45 @@
+import { Plugin } from "../plugin.class";
+import * as mysql from "mysql2/promise";
+
+export class DatabasePlugin extends Plugin {
+  constructor(name: string, private dbConnection: any) {
+    if (!dbConnection || typeof dbConnection.execute !== "function") {
+      throw new Error(
+        "Invalid database connection: must be a mysql2 connection with execute method"
+      );
+    }
+
+    super(name);
+  }
+
+  static init(
+    name: string,
+    config: {
+      host: string;
+      user: string;
+      password: string;
+      database: string;
+    }
+  ): DatabasePlugin {
+    const dbConnection = mysql.createConnection({
+      host: config.host,
+      user: config.user,
+      password: config.password,
+      database: config.database,
+    });
+
+    return new DatabasePlugin(name, dbConnection);
+  }
+
+  async run(query): Promise<{
+    rows: any[];
+    fields: any[];
+  }> {
+    const [rows, fields] = await this.dbConnection.execute(query);
+    return { rows, fields };
+  }
+
+  onFinish() {
+    this.dbConnection.end();
+  }
+}