Add support for ESP32-S3 PowerFeather

[powerfeatherdev]

Description of Change

Adds a new variant directory for esp32s3_powerfeather, under which the pins_arduino.h is created.
Entries for esp32s3_powerfeather in boards.txt are added.

Tests scenarios

• pins_arduino.h is ok
• boards.txt entries are ok

Related links

Website: https://www.powerfeather.dev/
Allocation for PID under Espressif VID used in this PR: espressif/usb-pids#123

[CLAassistant]

All committers have signed the CLA.

[powerfeatherdev]

Hello @SuGlider, @me-no-dev, @P-R-O-C-H-Y this is my first time adding support for a new board for Arduino (one that I created). I patterned the changes in this PR after other PR's adding support for a new board, and found that they add entries in the boards.txt file and create a variant directory with a pins_arduino.h header inside.

I currently have arduino-esp32 as a component, and so verified that pins_arduino.h works. However, I don't know how to test the entries in the boards.txt locally, as I don't know how to point the Additional Boards Manager URLs to maybe the branch I'm trying to merge in this PR.

Can you point me in the right direction?

[me-no-dev]

@P-R-O-C-H-Y ptal :)

[powerfeatherdev]

Thanks for the guidance @me-no-dev, much appreciated! I've made most of the changes you suggested, ptal.

[P-R-O-C-H-Y]

Hi @powerfeatherdev, "This branch has conflicts that must be resolved". Can you please fix it? Also merge the latest changes from master into this branch. Thanks

[powerfeatherdev]

Hi @P-R-O-C-H-Y, resolved by rebasing to latest master.

[P-R-O-C-H-Y]

Hi @powerfeatherdev, PTAL on my comments.

[powerfeatherdev]

Fixed @P-R-O-C-H-Y

[powerfeatherdev]

Thank you very much @P-R-O-C-H-Y and @me-no-dev !