feat: BitTorrent v2 Support

[leoherzog]

What is the purpose of this pull request? (put an "X" next to item)

[ ] Documentation update [ ] Bug fix [X] New feature [ ] Other, please explain:

What changes did you make? (Give an overview) Added support for decoding and encoding of infoHashV2 key for BitTorrent v2 Support.

Which issue (if any) does this pull request address? webtorrent/parse-torrent#88

Is there anything you'd like reviewers to focus on? I need a hand updating the tests. I'm not familiar with tape, and I suspect that there are at least a couple of assumptions made in testing that each Torrent object should always must have an infoHash key. The new assumption is a valid object can have an infoHash key, or an infoHashV2 key, or both.

[welcome[bot]]

🙌 Thanks for opening this pull request! You're awesome.

[DiegoRBaquero]

The assumption is valid, it should have either v1 or v2, or both.

[leoherzog]

Hey reviewers. What's left to be done to advance this PR?

@feross @DiegoRBaquero