Log CAN traces

[ryanpdx]

It would be great to log all the CAN traffic data for for the last 30days, allow us to download the data for increased granularity beyond the beacon logs or beacons received by SatNOGS stations.

I would make each boot log to it own file as these files could be a little large to download on their own (it depends on which cards are on and what state they are in).

I would recommend saving all CAN traces to one private directory.

There are a bunch of CAN trace formats (the python CAN library does support writing to them), but they are not optimized for their size as they can store unnecessary meta data for OreSat's needs. May need to write a custom format to reduce the file sizes.