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send duplicate responses to the session peer manager to track latencies

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

Move the job of splitting requests to its own package

Reduce duplicates through splits of requests

Add a unit test and do some additional decoupling

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

remove for loop not needed, cleanup spelling

- moved sessions out of main bitswap package
- modified session manager to manage all sessions
- moved get functions to their own package so sessions can directly

BREAKING CHANGE: SessionsForBlock, while not used outside of Bitswap, has been removed, and was an
exported function

per https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences

Extract session manager from bitswap
Extract session manager & want manager to package
Move want manager message queue to seperate file
Move Message Queue to subpackage
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