Initial addition of BitTorrent protocol

[RangerMauve]

• Adds new BitTorrent protocol
• Integrates bt-fetch and it's Torrent Manager code for dealing with mutable torrents (BEP 46)
• Updated types to add bt everywhere for bittorrent options
• Updated protocol tests with basic BitTorrent smoke test

Before I get way further it'd be nice if I could get a vibe check on what we have so far and answer any questions about it.

[jackyzha0]

generally looks good! a few questions/nits

[fauno]

https://0xacab.org/sutty/distributed-press-api-client/-/issues/12

Tracking the client side

[jackyzha0]

lgtm! small non-blocking question

[jackyzha0]

Is there nothing for unsync?

[RangerMauve]

Whoops, not yet. It's a TODO.

[RangerMauve]

Also, a question. What should we do about existing sites that don't have the protocol set already? I was thinking in the sites.get() function we could check for missing properties and add them in. cc @jackyzha0 thoughts?

[jackyzha0]

Might be good to start thinking about migration scripts? Ideally a one-time thing instead of something that runs on every GET call. Let's discuss this more on call but we should figure out a smooth way for people to upgrade DP instances without data-loss

[resession]

great stuff