Add missing lock.py file

Was supposed to be part of the kogan lock support commit, but as it is a new file got missed by the commit.

custom_components/tuya_local/kogan_heater/lock.py

@@ -0,0 +1,64 @@
+"""
+Platform to control the child lock on Kogan WiFi-connected heaters and panels.
+"""
+from homeassistant.components.lock import STATE_LOCKED, STATE_UNLOCKED, LockDevice
+from homeassistant.const import STATE_UNAVAILABLE
+
+from ..device import TuyaLocalDevice
+from .const import ATTR_CHILD_LOCK, PROPERTY_TO_DPS_ID
+
+
+class KoganHeaterChildLock(LockDevice):
+    """Representation of a Kogan WiFi-connected heater child lock."""
+
+    def __init__(self, device):
+        """Initialize the lock.
+        Args:
+            device (TuyaLocalDevice): The device API instance."""
+        self._device = device
+
+    @property
+    def should_poll(self):
+        """Return the polling state."""
+        return True
+
+    @property
+    def name(self):
+        """Return the name of the lock."""
+        return self._device.name
+
+    @property
+    def unique_id(self):
+        """Return the unique id for this heater child lock."""
+        return self._device.unique_id
+
+    @property
+    def device_info(self):
+        """Return device information about this heater child lock."""
+        return self._device.device_info
+
+    @property
+    def state(self):
+        """Return the current state."""
+        if self.is_locked is None:
+            return STATE_UNAVAILABLE
+        else:
+            return STATE_LOCKED if self.is_locked else STATE_UNLOCKED
+
+    @property
+    def is_locked(self):
+        """Return the a boolean representing whether the child lock is on or not."""
+        return self._device.get_property(PROPERTY_TO_DPS_ID[ATTR_CHILD_LOCK])
+
+    async def async_lock(self, **kwargs):
+        """Turn on the child lock."""
+        await self._device.async_set_property(PROPERTY_TO_DPS_ID[ATTR_CHILD_LOCK], True)
+
+    async def async_unlock(self, **kwargs):
+        """Turn off the child lock."""
+        await self._device.async_set_property(
+            PROPERTY_TO_DPS_ID[ATTR_CHILD_LOCK], False
+        )
+
+    async def async_update(self):
+        await self._device.async_refresh()