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feat: prioritize more important wants

In case we're sending a _lot_ of wants:

* Prioritize cancels.
* Then targeted wants.
* Finally broadcast wants.

fix: in message queue only send cancel if want was sent

* docs: add separate how bitswap works doc

* feat: update architecture diagram and add implementation description

fix: ensure wantlist gauge gets decremented on disconnect

avoid copying messages and improve logging

Also, reduce the overhead from logging.

fix: log unexpected condition in peerWantManager.prepareSendWants()

This makes it easier to tell where module boundaries are.

wait for sessionWantSender to shutdown before completing session shutdown

Bumps [go.uber.org/zap](https://github.com/uber-go/zap) from 1.10.0 to 1.14.1.
- [Release notes](https://github.com/uber-go/zap/releases)
- [Changelog](https://github.com/uber-go/zap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uber-go/zap/compare/v1.10.0...v1.14.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

chore(deps): bump github.com/libp2p/go-libp2p from 0.6.0 to 0.6.1

Bumps [github.com/libp2p/go-libp2p](https://github.com/libp2p/go-libp2p) from 0.6.0 to 0.6.1.
- [Release notes](https://github.com/libp2p/go-libp2p/releases)
- [Changelog](https://github.com/libp2p/go-libp2p/blob/master/NEWS.md)
- [Commits](https://github.com/libp2p/go-libp2p/compare/v0.6.0...v0.6.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Perf/message queue

This got dropped from my other patch.

feat: add a custom CID type

This allows us to marshal/unmarshal/size protobufs without copying CID around.

fixes #302

This removes one goroutine per peer which tends to be a pretty big deal. This
brings go-ipfs down from 5.5 to 4.5 goroutines per peer.