Enable config flow for Luftdaten (#17700)

* Move file to new location

* Update requirement

* Enable config flow

* Add luftdaten

* Add tests

* Update

* Add constants

* Changes according to the review comments

* Remove wrong entry from flows

* Fix dict handling

* Add callback and use OrderedDict

* Remve leftover

* Fix

* Remove await

script/gen_requirements_all.py

@@ -50,12 +50,12 @@ TEST_REQUIREMENTS = (
     'evohomeclient',
     'feedparser',
     'foobot_async',
-    'gTTS-token',
     'geojson_client',
     'georss_client',
+    'gTTS-token',
+    'ha-ffmpeg',
     'hangups',
     'HAP-python',
-    'ha-ffmpeg',
     'haversine',
     'hbmqtt',
     'hdate',
@@ -65,6 +65,7 @@ TEST_REQUIREMENTS = (
     'influxdb',
     'libpurecoollink',
     'libsoundtouch',
+    'luftdaten',
     'mficlient',
     'numpy',
     'paho-mqtt',