Add device: Shelly - Flood Gen4 (#4190)

Co-authored-by: gorischek <37111647+gorischek@users.noreply.github.com>

Author: github-actions[bot]

library/library.json

@@ -11345,6 +11345,14 @@
             "manufacturer": "ZVIDAR",
             "model": "Z-CM-V01",
             "battery_type": "Rechargeable"
+        },
+        {
+            "manufacturer": "Shelly",
+            "model": "Flood Gen4",
+            "model_id": "S4SN-0071A",
+            "hw_version": "gen4",
+            "battery_type": "AA",
+            "battery_quantity": 4
         }
     ]
 }