Add MKS UI (TFT_LITTLE_VGL_UI) (#18071)

Marlin/Configuration.h

Marlin/src/MarlinCore.cpp

Marlin/src/inc/Conditionals_LCD.h

Marlin/src/lcd/extui/lib/mks_ui/SPI_TFT.cpp

Marlin/src/lcd/extui/lib/mks_ui/SPI_TFT.h

Marlin/src/lcd/extui/lib/mks_ui/W25Qxx.cpp

Marlin/src/lcd/extui/lib/mks_ui/W25Qxx.h

Marlin/src/lcd/extui/lib/mks_ui/draw_about.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_about.h

Marlin/src/lcd/extui/lib/mks_ui/draw_change_speed.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_change_speed.h

Marlin/src/lcd/extui/lib/mks_ui/draw_dialog.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_dialog.h

Marlin/src/lcd/extui/lib/mks_ui/draw_error_message.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_error_message.h

Marlin/src/lcd/extui/lib/mks_ui/draw_extrusion.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_extrusion.h

Marlin/src/lcd/extui/lib/mks_ui/draw_fan.cpp

Marlin/src/lcd/extui/lib/mks_ui/draw_fan.h

Marlin/src/lcd/extui/lib/mks_ui/draw_home.cpp