fix(db operations): Update transaction API to consistently pass optional session parameters across database operations

ts/classes.db.ts

@@ -63,6 +63,12 @@ export class SmartdataDb {
     this.status = 'disconnected';
     logger.log('info', `disconnected from database ${this.smartdataOptions.mongoDbName}`);
   }
+  /**
+   * Start a MongoDB client session for transactions
+   */
+  public startSession(): plugins.mongodb.ClientSession {
+    return this.mongoDbClient.startSession();
+  }
 
   // handle table to class distribution