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

fixes #238

This is an interesting bug because changes to the DHT have suddenly started
triggering it. I'm not sure _why_ we weren't hitting it before now.

We may have been ignoring a context somewhere?

This can happen even when everything is working correctly.

fixes https://github.com/ipfs/go-ipfs/issues/6046

Otherwise, we'll wait forever.

Keep channels unblocked in cancelling request -- refactored to function. Also cancel find provider
context as soon as it can be.

Make sure if all requestors cancel their request to find providers on a peer, the overall query gets
cancelled

removed session id user completely from providerquerymanager

Add debug logging for the provider query manager and make tests more reliable

Add functionality to timeout find provider requests so they don't run forever

Add a manger for querying providers on blocks, in charge of managing requests, deduping, and rate
limiting