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Add a manger for querying providers on blocks, in charge of managing requests, deduping, and rate
limiting

fix(tests): stabilize session tests

Improve stability of tests for Session and SessionPeerManager

fix #61

contexts: make sure to abort when a context is canceled

Also, buffer single-use channels we may walk away from. This was showing
up (rarely) in a go-ipfs test.

fix(sessions): explicitly connect found peers

Remove sync.waitGroup in SessionPeerManager till it's needed

when providers are found in a session, explicitly connect them so they get added to the peer manager

fix #53

gx publish 1.1.20

Speed up sessions Round #1

Encapsulate functions for readability, and move code for understanding

Move the job of splitting requests to its own package

As soon as peers appear, consume all of the want budget

Reduce duplicates through splits of requests

Order optimized peers by most recent to receive a block

Fix debug log formatting issues

Feat/bandwidth limited tests

Updated Libp2p and used it's newly exposed RateLimiter public interface

Limits connection bandwidth in real world benchmarks so that blocks are delayed if single peer is
overused

fix #40

make both performance benchmarks write to a tmp dir and put in the .gitignore

fix(tests): stabilize unreliable session tests

fix #43

gx publish 1.1.19

Bitswap Refactor #4: Extract session peer manager from sessions

Add a unit test for session package

Add unit test for sessionpeermanger and comment exported methods

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

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