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To reduce future import cycles, and expose more types properly, move the root package to an
interface/types file and move the main implementation into /impl. This also exposes an interface
other implementers can replace.

limit the size of blocks sent in a response to 512k a.l.a. bitswap

Adds callbacks to manage connections, also removes network receiver methods from public graphsync
interface, and updates libp2p to handle go-libp2p-core refactor

move link tracker out of response manager so it can be used for requests

Complete functionality to initialize response manager and process incoming requests

fix #7, fix #8

Creates the Response Manager that processes incoming requests, initiates selector traversal, and
generates responses

Refactor peer manager to handle abstract processes, then use the base class for the peer message
manager and the peer response manager

Create a response manager for a single peer to handle assembling and managing responses for a given
peer