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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

Re-setup provider search delay and rebroadcast delay on a per bitswap instance basis

on a tick, do not keep searching for providers for the same block. instead rely on a periodic search
for more providers. (which will run no matter what, even w/o ticks, to optimize found providers).
also backoff tick time to reduce broadcasts.

fix #95, fix #107

Improve stability of tests for Session and SessionPeerManager

fix #61

Encapsulate functions for readability, and move code for understanding

Move the job of splitting requests to its own package

As soon as peers appear, consume all of the want budget

Reduce duplicates through splits of requests

fix #43

Add a unit test for session package