Add device: Shelly - Shelly Flood Gen4 (S4SN-0071A) (#4605)

Co-authored-by: wendefeuer <12216662+wendefeuer@users.noreply.github.com>

Author: github-actions[bot]

library/library.json

@@ -12370,6 +12370,13 @@
             "manufacturer": "ZVIDAR",
             "model": "Z-CM-V01",
             "battery_type": "Rechargeable"
+        },
+        {
+            "manufacturer": "Shelly",
+            "model": "Shelly Flood Gen4 (S4SN-0071A)",
+            "model_id": "gen4",
+            "battery_type": "AA",
+            "battery_quantity": 4
         }
     ]
 }