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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