Add access to CRC status and enable

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

Start by comparing the linked Adafruit_CircuitPython_RFM9x implementation, then inspect the RFM69 module's CRC handling and relevant register definitions. Done means the RFM69 interface exposes CRC status and enable/disable controls consistent with the data sheet and the RFM9x pattern.

Written by the indexing model from the issue text.