Add Uonet+ Vulcan integration (#56357)

* Add Uonet+ Vulcan integration

* Add "configuration_url", fix some minor issues

* Refactor and fix tests

* Optimize code

* Apply suggestion from code review

Co-authored-by: Maciej Bieniek <bieniu@users.noreply.github.com>

* Update error handling

* Fix some tests

* Update CODEOWNERS and fix pylint

* Cleanup vulcan tests

* Run prettier

Co-authored-by: Maciej Bieniek <bieniu@users.noreply.github.com>
Co-authored-by: Erik Montnemery <erik@montnemery.com>

homeassistant/generated/config_flows.py

@@ -376,6 +376,7 @@ FLOWS = {
         "vizio",
         "vlc_telnet",
         "volumio",
+        "vulcan",
         "wallbox",
         "watttime",
         "waze_travel_time",