support RAK10701 touchscreen

[DanielCao0]

Support touchscreen for the Board RAK10701 , which uses the RAK14014 to implement the touchscreen function . The touch chip model is FT6336U.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

:white_check_mark: mverch67
:white_check_mark: caveman99
:x: DanielCao

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[caveman99]

@DanielCao0 no need to close the pull request, you can simply keep pushing commits to your branch and they will appear here...

[DanielCao0]

I'm still modifying the code, I'll pull again, I'm adding the UI of the virtual keyboard

[caveman99]

@DanielCao0 i'll mark the Pull Request as a 'draft' and we can keep it open. When you are satisfied, mark as 'ready for review'. This way the Github CI will build images with your changes.