Add config flow to Twitch (#93451)
* Update twitch API
* Update twitchAPI
* Add tests
* Apply suggestions from code review
Co-authored-by: Franck Nijhof <frenck@frenck.nl>
* Update sensor.py
* Update sensor.py
* Update sensor.py
* Update sensor.py
* Update sensor.py
* Fix coverage
* Move Twitch constants to separate file
* Move Twitch constants to separate file
* Move Twitch constants to separate file
* Add application credentials
* Add config flow
* Try to add tests
* Add strings
* Add tests
* Add tests
* Improve tests
* Fix tests
* Extract Twitch client creation
* Fix reauth
* Remove import flow
* Remove import flow
* Remove reauth
* Update
* Fix Ruff
* Fix feedback
* Add strings
* Add reauth
* Do stuff in init
* Fix stuff
* Fix stuff
* Fix stuff
* Fix stuff
* Fix stuff
* Start with tests
* Test coverage
* Test coverage
* Remove strings
* Cleanup
* Fix feedback
* Fix feedback
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Co-authored-by: Franck Nijhof <frenck@frenck.nl>
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