Add emulated_roku component (#17596)

* Add emulated_roku component

* Add emulated_roku config tests

* Fix emulated_roku test dependencies

* Remove emulated_roku yaml support, add tests

* Add yaml support, simplify config flow

* Improve emulated_roku code quality

* Fix emulated_roku translation, improve code quality

* Fix emulated_roku translation

* Bump emulated_roku to 0.1.6 to fix SSDP discovery

* Bump emulated roku to 0.1.7, refactor component start/stop methods