Add example application of TCP-over-ringbuffers

[lmbollen]

What (what did you do)
Adds library functions to implement TCP over ringbuffer communication and an example application that showcases how to use it.

Why (context, issues, etc.)
We want to be able to perform asynchronous communications and plan to solve that using TCP over ringbuffers.

Dear reviewer (anything you'd like the reviewer to pay close attention to?)

AI disclaimer (heads-up for more than inline autocomplete)

TODO

Cross-out any that do not apply

• Rewrite to work on the new ringbuffers
• Write (regression) test
• Update documentation, including docs/
• Link to existing issue