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send duplicate responses to the session peer manager to track latencies

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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