Add support for 'WeAct Studio Epaper Module' 4.2 Inch screen

[RaceNJason]

Component name

Waveshare E-Paper Display

Link to component documentation on our website

https://esphome.io/components/display/waveshare_epaper.html#waveshare-e-paper-display

Describe the enhancement

I see that support for the 2.9" WeAct Studio ePaper display has been added as 2.90in3c (at least the 3-color version). Two requests...

The obvious first is to add support now for the 4.2" WeAct Studio ePaper display since none of the current 4.2" models appear to work for it. I have both the BW and the BWR models. I couldn't get either to work with any of the 4.2" models currently showing on the ESPHome documentation page. I cannot seem to find anyone else online that has done this either...other than pr#6209 for BW (but doesn't appear for BWR)

Going back to my 2.9" WeAct Studio ePaper display worked (not just the model selection - I mean that was the actual screen I had been using and '2.90in3c' model was what I was using successfully even though that one isn't listed in the official documentation page - am using external_component pr#6226). I basically was trying to upgrade to the larger 4.2" display so I can fit more onto it at once. So I know, code wise, that everything else about my project works correctly.

Use cases

Seems more and more people are using the WeAct Studio ePaper line of displays, if it's an easy mod than it would definitely benefit other users I'm sure

[github-actions[bot]]

🏷️ I've automatically added the component: waveshare_epaper label to help categorize this feature request.