feat: porting spi basic module functions #137
Merged
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Addressing partly #105
This will enable the use of SPI expansion header with external sensors.
Tested 8-bit read/write/exchange operations against NRF24 radio module using this datasheet. 16-bits methods are also in code at a fork until they are tested against a sensor using 16-bit transactions. Therefore this PR only address 8-bit functions.