Implement SW version and board serial number in radio, or otherwise uniquely identify boards

In GitLab by @matthew.morley.ca on Mar 19, 2023, 12:25

Currently, both are hard coded to 0, which makes figuring out which FCB radio messages coming from hard.

STMs come with a hard coded 96 bit UID, we could hard code UID->SN associations?

We have git_info, we could hash the tag to generate a software version string? Or periodically send the full git describe output? I'm not convinced that the software version in every single radio message is _actually_ helpful unless we are making lots of breaking radio changes and keeping old FCBs around with out of date packet structures?