feat(olight_ostation2_batterycharger): rename to follow naming convention

- backward compatibility provided by legacy_type
- add WiFi version product id from #6069

custom_components/tuya_local/devices/olight_ostation_2_battery_charger.yaml → custom_components/tuya_local/devices/olight_ostation2_batterycharger.yaml

@@ -1,4 +1,5 @@
 name: Battery charger
+legacy_type: olight_ostation_2_battery_charger
 products:
   - id: 1fnensm6
     manufacturer: Olight
@@ -6,6 +7,9 @@ products:
   - id: v8znljza
     manufacturer: Olight
     model: Ostation 2
+  - id: rcj4z3pdmhkzflio
+    manufacturer: Olight
+    model: Ostation 2
 entities:
   - entity: switch
     dps: