Lagute LW-12 Wifi LED control (#13307)

* Added platform lw12wifi for Lagute LW-12 Wifi Lights

Supported features:
* RGB colors
* Variable brightness
* 29 effects
* Changing transitions speed for animated effects

* Added lw12wifi to the list of omitted files to test

* Added lw12 module as new requirement for lw12wifi platform

* Added configuration example docstring for platform lw12wifi

* Updating code according to review in PR:

* Removed unused imports: enum, socket.
* Unused and not imported feature SUPPORT_FLASH was removed.
* Unused import lw12 in setup_platform method removed.
* Fixed indention for valuptuous.
* Changed check if effect is None.
* Removed personal debug output.
* Blocking function are not async anymore.

* Further improvements to satisfy PR.

* Unused import asyncio removed.
* Fixed: Return value and docstring no match up for `assumed_state`.

* Check if the set effect is supported, otherwise revert to normal light.

* Added describing missing docstrings to all functions.

* Adopted code to work with HS color setting.

* Syntactical change in comment.

* Removed redefinition of DOMAIN.

* Refactored lw12 controller setup: removed requirement for host and port in LW12Wifi class.

* Rewritten supported feature setup to a more static  expression.

* Removed unused rgb_color property

* Fixed typo in comment for set_light_option

* Changed RGB option validation schema

* Removed instance properties as config options

* Removed optional settings to be more inline with code style.

* Removed unused option from config example

* Removal of unused import

* Added property to disable state polling for this entity.

* Raise an exception if an unknown effect was selected.

* Fixed an issue with the check for known effects.

* As we do not need to set a default, use simple accessing by key.

* Log if an unknown effect was selected.

* Added link to future documentation.