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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

Return optimized peers in real latency order, weighted toward recent
requests

ci(circleci): add benchmark comparisons

Remove unused code, follow conventions

Run benchmarks before and after, compare results

add proper usage of go benchmark timing and environment random seed support for CI

aggressively free memory

Enchanced logging for bitswap

fix: rand.Intn(0) panics

This ensures we don't keep large buffers allocated.

dep: update peertaskqueue

fixes performance regression

fix some naming nits and broadcast on search

Small deps update

This fixes the case where:

1. I start downloading something.
2. A friend jumps on our WiFi.
3. Our IPFS daemons connect via local discovery.
4. I never notice that they have the file I'm looking for because I'm already downloading it from a peer.
5. The peer I'm downloading from is _really_ slow.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

feat(sessions): add rebroadcasting, search backoff

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

Don't count consecutive ticks if there are no active wants

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

testutil: fix block generator

dep: remove dep on libp2p/go-testutil

migrate to go-libp2p-core.

Update libp2p things

dep: tidy deps