Add Arweave Codec

[rekpero]

This PR adds an Arweave codec to ultimately add ENS support for Arweave Hashes.
Arweave is a decentralized CDN network that permanently stores any file on its network, find out more here.

[rekpero]

@vmx @Stebalien @rvagg Sorry for directly tagging you guys here, but would it be possible for anyone of you guys to take a look at this PR? We are trying to add ENS content hash support for Arweave Protocol so that I can integrate ENS into ArGoApp, and having a codec is a requirement.

[rvagg]

No problems @rekpero, I saw this but had to go fishing for someone who knows more about namespace entries than I. No objections have emerged and the skynet-ns entry suggests this is reasonable.

[vmx]

It was the same for me. I've also no objections, but a also a lack of knowledge in that space. No worries about tagging me.

[rekpero]

Thanks, @rvagg @vmx for merging this PR.

Just wanted to know when are you guys gonna release the new version of the lib so that we can test out our integration on the ENS side? Would be fine if you can give us a rough timeline for your release

[Abhimanyu121]

Hey, can I get a tentative release schedule for this PR?

[rvagg]

which lib in particular? there's no library in this repo but there's a number of dependencies that pull from here, you may need to submit a PR to whatever library you're depending on

[rekpero]

Thanks, @rvagg for the reply, I guess I just need to create a PR on js-multicodec with the updated table

[rekpero]

@rvagg check this out as well multiformats/js-multicodec#81