Add reference implementations

[not7cd]

These projects are fully featured and tested. In the next two weeks, they will be battle tested.
They were developed as part of rocketry project for my student association for EuRoC competition.

They might not be the best reference implementations, but I wasn't able to find anything else working here on github. They might not be up to the standards, but they work.

Thank you for enabling this project with your library.

[aentinger]

Good Morning @not7cd 👋 ☕
I'm glad to read that you've been able to use this library for your EuRoc project. Maybe you want to present it in the UAVCAN forum?

Unfortunately your project do not contain sufficient functionality to be called a reference implementation, it misses the register functionality for dynamic configuration. I know the same is true for the GNSS and ToF node, but those codes are under my sphere of influence so I can always update them while the same can't be said for your code. My compromise would be to list them under a "See also" header, very similar it's been done here (OpenCyphal-Garage/platform_specific_components#16). Would that be acceptable to you?