Added device support wf520d_wifi_dual_touch_dimmer

Tuya Smart WiFi Smart Touch Panel Dimmer Light Retrofit for Anchor Roma Modular Switch 2 Gang Modular switch (WF520D)

https://www.sonoff.in/product/smart-wifi-smart-touch-panel-dimmer-light-switch-2-gang-modular-switch-works-with-alexa-google-2/

custom_components/tuya_local/devices/wf520d_wifi_dual_touch_dimmer

@@ -0,0 +1,59 @@
+name: WF520D Dual Touch Dimmer
+primary_entity:
+  entity: light
+  name: Dimmer 1
+  dps:
+    - id: 1
+      type: boolean
+      name: switch
+    - id: 2
+      name: brightness
+      type: integer
+      range:
+        min: 10
+        max: 1000
+      mapping:
+        - scale: 3.92
+secondary_entities:
+  - entity: light
+    name: Dimmer 2
+    dps:
+      - id: 7
+        type: boolean
+        name: switch
+      - id: 8
+        name: brightness
+        type: integer
+        range:
+          min: 10
+          max: 1000
+        mapping:
+          - scale: 3.92
+  - entity: number
+    name: Minimum brightness 1
+    category: config
+    icon: "mdi:lightbulb-on-50"
+    dps:
+      - id: 3
+        type: integer
+        name: value
+        range:
+          min: 10
+          max: 1000
+        unit: "%"
+        mapping:
+          - scale: 10
+  - entity: number
+    name: Minimum brightness 2
+    category: config
+    icon: "mdi:lightbulb-on-50"
+    dps:
+      - id: 9
+        type: integer
+        name: value
+        range:
+          min: 10
+          max: 1000
+        unit: "%"
+        mapping:
+          - scale: 10