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Instead of copying these slices, we can just reuse them.

refactor: simplify messageQueue onSent

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