Add config flow to enigma2 (#106348)

* add config flow to enigma2

* Apply suggestions from code review

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

* fix suggested change

* use parametrize for config flow tests

* Restore PLATFORM_SCHEMA and add create_issue to async_setup_platform

* fix docstring

* remove name, refactor config flow

* bump dependency

* remove name, add verify_ssl, use async_create_clientsession

* use translation key, change integration type to device

* Bump openwebifpy to 4.2.1

* cleanup, remove CONF_NAME from entity, add async_set_unique_id

* clear unneeded constants, fix tests

* fix tests

* move _attr_translation_key out of init

* update test requirement

* Address review comments

* address review comments

* clear strings.json

* Review coments

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Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>