Add access to CRC status and enable

[jerryneedell]

According to the data sheet, the CRC is enabled by default.
Should there be properties that allow for enable/disable of the CRC and checking of the crc status?
Possibly this can be done in a similar way to how it is implemented for the RFM9x. https://github.com/adafruit/Adafruit_CircuitPython_RFM9x/blob/main/adafruit_rfm9x.py

[jerryneedell]

This has been implemented in the Adafruit_CircuitPyhton_RFM library. https://github.com/adafruit/Adafruit_CircuitPython_RFM/blob/main/adafruit_rfm/rfm69.py#L556