Logi Circle public API refactor and config flow (#20624)

* Logi Circle now uses OAuth2 for authentication, added config flow.

* Service calls now dispatched to camera entities via signalled events

* Update from PR review

* Add unit tests for config flow

* Updated CODEOWNERS

* Reverted change to .coveragerc

* Improved test coverage of config flow

homeassistant/components/logi_circle/const.py

@@ -0,0 +1,43 @@
+"""Constants in Logi Circle component."""
+
+CONF_CLIENT_ID = 'client_id'
+CONF_CLIENT_SECRET = 'client_secret'
+CONF_API_KEY = 'api_key'
+CONF_REDIRECT_URI = 'redirect_uri'
+
+DEFAULT_CACHEDB = '.logi_cache.pickle'
+
+DOMAIN = 'logi_circle'
+DATA_LOGI = DOMAIN
+
+LED_MODE_KEY = 'LED'
+RECORDING_MODE_KEY = 'RECORDING_MODE'
+
+# Sensor types: Name, unit of measure, icon per sensor key.
+LOGI_SENSORS = {
+    'battery_level': [
+        'Battery', '%', 'battery-50'],
+
+    'last_activity_time': [
+        "Last Activity", None, 'history'],
+
+    'recording': [
+        'Recording Mode', None, 'eye'],
+
+    'signal_strength_category': [
+        "WiFi Signal Category", None, 'wifi'],
+
+    'signal_strength_percentage': [
+        "WiFi Signal Strength", '%', 'wifi'],
+
+    'streaming': [
+        'Streaming Mode', None, 'camera'],
+}
+
+SIGNAL_LOGI_CIRCLE_RECONFIGURE = 'logi_circle_reconfigure'
+SIGNAL_LOGI_CIRCLE_SNAPSHOT = 'logi_circle_snapshot'
+SIGNAL_LOGI_CIRCLE_RECORD = 'logi_circle_record'
+
+# Attribution
+ATTRIBUTION = "Data provided by circle.logi.com"
+DEVICE_BRAND = 'Logitech'