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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

Improve stability of tests for Session and SessionPeerManager

fix #61

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

fix #43

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