Cross-client Devnet

[dutterbutter]

Issue summary

• Dedicated testnet to test interoperability between alternative gossamer nodes (e.g. substrate nodes)

Other information and links

[danforbes]

@noot did you mention that there may be some existing documentation related to this?

[noot]

@danforbes @arijitAD worked on it but I can't find it anywhere. we'll probably need to redo it.

[danforbes]

Maybe @arijitAD can bless our inboxes with a HackMD link to a design doc, if it exists 😅 🙇🏻