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

Bitswap Refactor #3: Extract sessions to package

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

docs(comments): end comment sentences to have full-stop

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

Bitswap Refactor #2: Extract PeerManager From Want Manager + Unit Test

Finishing adding comments to WantManager and PeerManager, refactor message structure for type
safety, add sending messages test

Seperates the functions of tracking wants from tracking peers
Unit tests for both peer manager and want manager
Refactor internals of both to address synchonization issues discovered
in tests

Bitswap Refactor #1: Session Manager & Extract Want Manager

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
Respond to PR Comments

fix(Receiver): Ignore unwanted blocks

feat(Benchmarks): Add real world dup blocks test

- add a delay generator that similates real world latencies one might encounter on the internet
- modify virtual network to accept different latencies for different
peers based on using NextWaitTime on passed delay
- modify dup_blocks_test subtestDistributeAndFetch to accept a custom
delay
- Add a real world benchmarks that simulates the kinds of problems one might
encounter bitswaping with a long lived session and a large swarm of
peers with real world latency distributions (that causes #8 not to
function well in practice)

If Bitswap receives a block that isn't in it's wantlist, is should ignore it

fix #21 fix #22

gx publish 1.1.17

Feat/bitswap pr improvements

So that CI passes, and because it's not reliable as a test, and is more a benchmark to measure
performance, convert dup_block_test.go to a benchmark, which can be run using `go test -bench .`

delay finding providers

It's expensive and causes quite a bit of dialing. Let's give bitswap a second to
work it's magic before we try this.

fixes #16

buffer writes

Let's not split every wantlist into a length and a wantlist...