boards: arm: Add support for WeAct Studio MiniSTM32H743 Core board

Adds the device trees, Kconfig, and documentation files.

The following features have been confirmed working on hardware:
* LED
* Button
* ST7735 TFT-LCD
* External QuadSPI NOR Flash memory
* External SPI NOR Flash memory
* USB CDC ACM
* microSD card

Signed-off-by: Charles Dias <charlesdias.cd@outlook.com>
10 files changed