Add DRIVER_NAME constant for nodejs-sql-driver

Author: samikshya-db

lib/telemetry/types.ts

@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+/**
+ * Driver name constant for telemetry
+ */
+export const DRIVER_NAME = 'nodejs-sql-driver';
+
 /**
  * Event types emitted by the telemetry system
  */