feat(services): update getAvailable method in mysql.service

- Transform `getAvailable` method into a promise that retrieves available vehicles from the database.
- This method now takes the MySQL handler object to execute the query and returns a promise that resolves to an array of available vehicles.
- It also handles error while executing the query.

Issue: #20
Signed-off-by: Mathis <yidhra@tuta.io>

src/services/mysql.service.ts

@@ -687,20 +687,23 @@ const MySqlService = {
 			});
 		},
 
-		//TODO get available
-		getAvailable(handler: MysqlHandler, data: IDbVehicle) {
+		/**
+		 * Retrieves the available vehicles from the database.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler object used to execute the query.
+		 * @returns {Promise<Array<IDbVehicle>>} A promise that resolves to an array of available vehicles.
+		 * @throws {Error} If an error occurs while executing the query.
+		 */
+		getAvailable(handler: MysqlHandler): Promise<Array<IDbVehicle>> {
 			return new Promise((resolve, reject) => {
-
-			})
-		},
-
-		//TODO get out of due date
-		getDue(handler: MysqlHandler, data: IDbVehicle) {
-			return new Promise((resolve, reject) => {
-
+				const _sql = "SELECT * FROM `vehicles` WERE `isAvailable` = 1";
+				try {
+					resolve(handler.query(_sql) as unknown as Array<IDbVehicle>);
+				} catch (err: unknown) {
+					reject(err as Error);
+				}
 			})
 		}
-
 	},
 	Category: {
 		/**