engines moved to separate library

lib/engines/default/DatabaseAnalyser.js

@@ -0,0 +1,19 @@
+class DatabaseAnalyser {
+  /**
+   *
+   * @param {import('dbgate').EngineDriver} driver
+   */
+  constructor(pool, driver) {
+    this.pool = pool;
+    this.driver = driver;
+    this.result = DatabaseAnalyser.createEmptyStructure();
+  }
+  async runAnalysis() {}
+}
+
+/** @returns {import('dbgate').DatabaseInfo} */
+DatabaseAnalyser.createEmptyStructure = () => ({
+  tables: [],
+});
+
+module.exports = DatabaseAnalyser;