refactor: move codes into src folder

src/lib/connectors/index.ts

@@ -0,0 +1,22 @@
+import { Connection, Engine } from "@/types";
+import mysql from "./mysql";
+import postgres from "./postgres";
+
+export interface Connector {
+  testConnection: () => Promise<boolean>;
+  execute: (databaseName: string, statement: string) => Promise<any>;
+  getDatabases: () => Promise<string[]>;
+  getTables: (databaseName: string) => Promise<string[]>;
+  getTableStructure: (databaseName: string, tableName: string) => Promise<string>;
+}
+
+export const newConnector = (connection: Connection): Connector => {
+  switch (connection.engineType) {
+    case Engine.MySQL:
+      return mysql(connection);
+    case Engine.PostgreSQL:
+      return postgres(connection);
+    default:
+      throw new Error("Unsupported engine type.");
+  }
+};