[Unit Test] - LibP2P - Encoding and Decoding of the Stream

[mibuono]

Goal:

Start with unit tests and we can run through integration testing later. Some tests do exist, but we do not have an idea on the quality or coverage as a whole.

Stretch goal - would be cool to quantify the coverage - in the PR possibly add what % coverage we have.

Double stretch - see what lines of code and functions that are used the most and start with these. There is a tool called pprof that can be used to view this information.