Add config flow to AnthemAV integration (#53268)

* Add config flow to AnthemAV integration

* Add importing of existing configuration

* Change setting to optional and add default value

* Use entity attribute

* Reduce changes by removing additional media player properties

* Remove title from translation

* Refactor config flow and fix PR comments

* Fix a failing test because of wrong renaming

* Add typing and use existing class and enum

* Bump dependency to v1.3.1

* Remove unecessary async_reload_entry

* Fix requirements_test_all after rebase

* Add const for timeout and remove async_block in test

* Reapply CodeOwner and configflow after rebase

* Remove name from configflow

* Fix manifest prettier failure

* Simplify code and avoid catching broad exception

* Removed unused strings and translations

* Avoid asserting hass.data