Technical documentation and testing to improve the contributing experience

[moul]

• Improve the following bridge documentations: https://github.com/ipfs-shipyard/gomobile-ipfs
• Improve GoDoc: https://pkg.go.dev/github.com/ipfs-shipyard/gomobile-ipfs/go
• Add more unit tests

[jefft0]

Backlog until we have time.