Implement phase shifted PWM

[blazoncek]

Implement phase shifted PWM outputs to lower the demand on PSU and/or allow 2-channel polarity changed LED strips to function properly.

The discussion about (issues with) PWM started in #3962 as a result of crashes within PWM handling code.

Requested participants: @softhack007 @willmmiles @jw2013 @tablatronix and (optional) @Jason2866
Please follow up here from #3962 (comment)

References:
https://www.hackster.io/daniel232/esp32-generate-two-180-phase-shifted-pwms-c1010f
"On ESP8266, there is a hidden, but officially supported solution for PS-PWM" by @jw2013

[willmmiles]

Phase shifting on ESP32 was prototyped in #4115 and merged in #4129.

[blazoncek]

I am content with current implementation.

[lk-ek]

Just here to say thank you for your efforts! This works like a charm and made a friend of mine very happy as their opposite-polarity-fairy lights are now dimmable and controllable via their mobile :)