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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 commit extends the bitswap protocol with two additional wantlist properties:

* WANT_HAVE/HAVE: Instead of asking for a block, a node can specify that they
  want to know if any peers "have" the block.
* WANT_HAVE_NOT/HAVE_NOT: Instead of waiting for a timeout, a node can explicitly
  request to be told immediately if their peers don't currently have the given
  block.

Additionally, nodes now tell their peers how much data they have queued to send
them when sending messages. This allows peers to better distribute requests,
keeping all peers busy but not overloaded.

Changes in this PR are described in: https://github.com/ipfs/go-bitswap/issues/186

feat: process response message blocks as a batch

Better estimate latency per peer by tracking cancellations

When fetching optimized peers from the peer manager, return an optimization rating, and pass on to
request splitter

BREAKING CHANGE: interface change to GetOptimizedPeers and SplitRequests public package methods

Return optimized peers in real latency order, weighted toward recent
requests

removed session id user completely from providerquerymanager

Integrate the ProviderQueryManager into the SessionPeerManager and bitswap in general

re #52, re #49

Also, buffer single-use channels we may walk away from. This was showing
up (rarely) in a go-ipfs test.

Remove sync.waitGroup in SessionPeerManager till it's needed

when providers are found in a session, explicitly connect them so they get added to the peer manager

fix #53

Encapsulate functions for readability, and move code for understanding

Reduce duplicates through splits of requests

Order optimized peers by most recent to receive a block

Add unit test for sessionpeermanger and comment exported methods

extract the job of finding and managing peers for a session from the job of requesting blocks