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Or, really, just avoid accessing it. We don't need it.

This caused a concurrent map access panic under load.

* fix: use one less go-routine per session

* fix: send cancel when GetBlocks() is cancelled (#383)

* fix: send cancel when GetBlocks() is cancelled

* fix: in SessionManager shutdown nil out sessions

* fix: sessionWantSender perf

* make sessionWantSender.SignalAvailability() non-blocking

* Refactor SessionInterestManager (#384)

* refactor: customize SessionInterestManager

* refactor: SessionInterestManager perf

* fix: ensure broadcast when peer becomes unavailable and all other peers sent DONT_HAVE for CID

* fix: lint warnings

* refactor: simplify session want sender DONT_HAVE list

* fix: flaky test

* test: add session exhausted wants test

* docs: improve sessionWantSender processAvailability docs

This makes reading the docs much easier as it's clear what's "private" and
what's not.

fixes #238