Add MKS Robin Pro, MKS Robin Lite3 (#16163)

Marlin/src/core/boards.h

Marlin/src/inc/Conditionals_post.h

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

Marlin/src/pins/pins.h

Marlin/src/pins/ramps/pins_RAMPS.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_LITE.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_LITE3.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_MINI.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_NANO.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_PRO.h

buildroot/share/PlatformIO/ldscripts/mks_robin_lite3.ld

buildroot/share/PlatformIO/ldscripts/mks_robin_pro.ld

buildroot/share/PlatformIO/scripts/mks_robin_lite3.py

buildroot/share/PlatformIO/scripts/mks_robin_pro.py

config/examples/Mks/Robin_Lite3/Configuration.h

config/examples/Mks/Robin_Lite3/ReadMe.txt

config/examples/Mks/Robin_Pro/Configuration.h

config/examples/Mks/Robin_Pro/ReadMe.txt

platformio.ini