[SPIDriver] Separated classes in multiple files

sbs.conf

src/shared/drivers/spi/SPIBus.cpp

src/shared/drivers/spi/SPIBus.h

src/shared/drivers/spi/SPIDriver.h

src/shared/drivers/spi/SPIInterface.h

src/shared/drivers/spi/SPITransaction.cpp

src/shared/drivers/spi/SPITransaction.h