Start preparing for homekit_controller config entries (#21564)

* Start preparing for homekit_controller config entries

* Review feedback

* Review feedback

* Only use the vol.strip validator for pairing_code

* CV not required now

* Changes from review

* Changes after review

homeassistant/components/homekit_controller/const.py

@@ -0,0 +1,23 @@
+"""Constants for the homekit_controller component."""
+DOMAIN = 'homekit_controller'
+
+KNOWN_ACCESSORIES = "{}-accessories".format(DOMAIN)
+KNOWN_DEVICES = "{}-devices".format(DOMAIN)
+CONTROLLER = "{}-controller".format(DOMAIN)
+
+# Mapping from Homekit type to component.
+HOMEKIT_ACCESSORY_DISPATCH = {
+    'lightbulb': 'light',
+    'outlet': 'switch',
+    'switch': 'switch',
+    'thermostat': 'climate',
+    'security-system': 'alarm_control_panel',
+    'garage-door-opener': 'cover',
+    'window': 'cover',
+    'window-covering': 'cover',
+    'lock-mechanism': 'lock',
+    'motion': 'binary_sensor',
+    'humidity': 'sensor',
+    'light': 'sensor',
+    'temperature': 'sensor'
+}