Add custom types for position (#15204)

Marlin/Configuration_adv.h

Marlin/src/Marlin.cpp

Marlin/src/core/enum.h

Marlin/src/core/macros.h

Marlin/src/core/serial.cpp

Marlin/src/core/serial.h

Marlin/src/core/types.h

Marlin/src/core/utility.cpp

Marlin/src/core/utility.h

Marlin/src/feature/I2CPositionEncoder.cpp

Marlin/src/feature/I2CPositionEncoder.h

Marlin/src/feature/backlash.cpp

Marlin/src/feature/backlash.h

Marlin/src/feature/bedlevel/abl/abl.cpp

Marlin/src/feature/bedlevel/abl/abl.h

Marlin/src/feature/bedlevel/bedlevel.cpp

Marlin/src/feature/bedlevel/bedlevel.h

Marlin/src/feature/bedlevel/mbl/mesh_bed_leveling.cpp

Marlin/src/feature/bedlevel/mbl/mesh_bed_leveling.h

Marlin/src/feature/bedlevel/ubl/ubl.cpp