feat: Add LMI API integration for fetching sales data

- Integrate LMI API to fetch current sales data using the provided API key.
- Update SaleController to use Http facade for making API requests.
- Modify services configuration to include LMI API key.

.env.example

@@ -14,6 +14,8 @@ APP_MAINTENANCE_STORE=database
 
 BCRYPT_ROUNDS=12
 
+LMI_API_KEY=
+
 APP_STAGING=false
 
 OCTANE_SERVER=swoole