Update libp2p to 0.35

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Includes gossipsub 1.1 changes
• Currently broken when syncing, upgrades fail

Just going to keep as draft until I have more time to sink into debugging the issues

Reference issue to close (if applicable)

Closes

Other information and links

[cryptoquick]

I'm having trouble with updating the lockfile because of work being done in this PR.

See:

• Update rand requirement from 0.7 to 0.8 libp2p/rust-libp2p#1899
• Cargo.toml: Update rand and rand_core to 0.8 and 0.6 mcginty/snow#107

[cryptoquick]

This is a lot of good work! Only one small nitpick, feel free to ignore if you like. I like how you were able to minimize a few clones, too.