Add LensMask module to smartcam (#1385)

Ensures no error with devices that do not have the `lens_mask` component.

kasa/smartcam/modules/lensmask.py

@@ -0,0 +1,29 @@
+"""Implementation of lens mask privacy module."""
+
+from __future__ import annotations
+
+import logging
+
+from ..smartcammodule import SmartCamModule
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class LensMask(SmartCamModule):
+    """Implementation of lens mask module."""
+
+    QUERY_GETTER_NAME = "getLensMaskConfig"
+    QUERY_MODULE_NAME = "lens_mask"
+    QUERY_SECTION_NAMES = "lens_mask_info"
+
+    @property
+    def state(self) -> bool:
+        """Return the lens mask state."""
+        return self.data["lens_mask_info"]["enabled"] == "off"
+
+    async def set_state(self, state: bool) -> dict:
+        """Set the lens mask state."""
+        params = {"enabled": "on" if state else "off"}
+        return await self._device._query_setter_helper(
+            "setLensMaskConfig", self.QUERY_MODULE_NAME, "lens_mask_info", params
+        )