Add new uPesy boards as variant (#8778)

* Add uPesy EDU ESP32 board variant

* Add uPesy ESP32C3 Basic board variant

* Add uPesy ESP32C3 Basic board variant

* Add uPesy ESP32C3 Mini board variant + some tweak

* tweak uPesy C3 Mini pinout

tweak uPesy C3 Mini pinout

tweak uPesy C3 basic pinout

Add uPesy ESP32S3 pin variant

Add uPesy ESP32S3 pin variant

Tweak uPesy ESP32s3/C3 pinout variant

* add upesy esp32s3 config in boards.txt

* remove some lines that causes errors

* respect case for build.variant in boards.txt

* Update variants/uPesy_edu_esp32/pins_arduino.h

Co-authored-by: Jan Procházka <[email protected]>

* Update variants/uPesy_esp32c3_mini/pins_arduino.h

Co-authored-by: Jan Procházka <[email protected]>

* Update variants/uPesy_esp32c3_basic/pins_arduino.h

Co-authored-by: Jan Procházka <[email protected]>

* respect case for build.board in boards.txt

* remove empty lines in boards.txt

* rename option #8778 (comment)

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Co-authored-by: Jan Procházka <[email protected]>

Author: uPesy