* Remove dependency on modbus for stiebel_eltron
The modbus integration changed its setup, so it is
not possible anymore to have an empty hub.
* Add config flow
* Update pystiebeleltron to v0.1.0
* Fix
* Fix
* Add test for non existing modbus hub
* Fix tests
* Add more tests
* Add missing translation string
* Add test for import failure
* Fix issues from review comments
* Fix issues from review comments
* Mock stiebel eltron client instead of setup_entry
* Update homeassistant/components/stiebel_eltron/__init__.py
* Update homeassistant/components/stiebel_eltron/__init__.py
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Co-authored-by: Joostlek <joostlek@outlook.com>