HT16K33 KeyPad Support

[Oekel]

I have also created a Feature-Request for the TCA8418, but as I saw that the HT16K33 is allready supported as DisplayMatrix It would be great to have full support for its KeyScan functionality.

Here is a typical usecase for this:
https://asset.conrad.com/media10/add/160267/c1/-/gl/002300335DS01/datenblatt-2300335-tru-components-drucktastenfeld-tastenfeld-matrix-3-x-4-1-st.pdf

Here the link to existing dokumentation of the driver:
https://tasmota.github.io/docs/Displays/

And some inpressive Video to show it full possibilities:
https://www.youtube.com/watch?v=gmxLcom__kY&ab_channel=bornach