[Feature] Implement NXT color sensor checksum

[laurensvalk]

Is your feature request related to a problem? Please describe.
We receive information from the NXT Color Sensor here:

http://github.com/pybricks/pybricks-micropython/blob/d811a706da236068983aff9ecefc6465a50b06c6/lib/pbio/src/port_dcm_ev3.c#L402-L420

There is a note there saying:

        // REVISIT: Test checksum and exit on failure.

We have not yet done this, but may want to after all, to catch cases like #2601.

At the top of this file, set #define DEBUG 1 (instead of 0), to get debug prints in the Pybricks Code output pane for easy debugging.

What to do?

• In pbio_port_dcm_nxt_color_sensor_state_t add a field crc.
• In the loop that says Receive all calibration info, update this CRC as it comes in.
• After the loop, Compare it to the crc field in pbio_port_dcm_nxt_color_sensor_data_t.
• Return PBIO_ERROR_IO if they do not match.

[laurensvalk]

This is a relatively simple issue for anyone who is able to build the firmware. All you need is an EV3 brick and an NXT color sensor.

We will leave this open for a week. Let us know if you're interested in contributing. We're happy to help you!