Add config flow to Velux (#89155)
* Add config_flow
* Add old config import
* Change from platform setup to entry setup
* Improve yaml config import
* Allow multiple hosts
* Apply recommendations
* Add DeerMaximum as codeowner
* Apply recommendations
* Fix config schema
* Fix hass data
* Remove DeerMaximum from CODEOWNERS
* Try to fix tests in ci
* Try to fix tests in ci 2
* Try to fix tests in ci 3
* Revert: Try to fix tests in ci 3
* Add end-to-end flow to connection error test
* Fix rebase
* Add required changes
* Change deprecation date
* Import only valid config entries
* Improve issue creation
* Fix error type
* Add missing test
* Optimize issue creation
* Optimize tests
* Add check for duplicate entries
* Add already_configured message
* Create issue for duplicate entries
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