Add a Media Player Component for Channels (#12937)

* add Channels media player

* add Channels' services

* style 

* more 

* make up your mind robot

*   

* dump client and pull it in via a package

* ChannelsApp -> ChannelsPlayer

* load the lib

* add pychannels in requirements

* not using requests anymore

* extra line 

* move this here

* move this up

* 

* use constants for these

* add a platform schema

* force update here

* get defaults to None

* break out after finding it

* use None for state if offline or errored

* pull in CONF_NAME

* fix syntax

* update requirements_all.txt

* :lipstick::lipstick::lipstick:

* 

* docs

* like this? ¯\(°_o)/¯