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Extract metadata encoding to a package and add a decoding feature

Proposal: Graphsync Public Interfaces

Co-Authored-By: hannahhoward <hannah@hannahhoward.net>

Outline interfaces for using Graphsync in a readme.

Graphsync responds to incoming 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 loader that wraps the underlying store loader and sends to network

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

add a response builder that collects components of a response and then assembles a completed
response message

Create a link tracker that helps dedup block sends and also track if blocks are missing from
requests

Update the IPLD bridge for the newest version of IPLD prime and add a node builder method.

Convert GraphSyncRequest and GraphSyncResponse to structs, track by value, pass directly into add
methods on GraphSyncMessage

Add the ability to send blocks and receive notification when complete to messagequeue

Create a prioritized task queue for tracking blocks of tasks between peers

Graphsync user can make request to the network

Initializes a new top level interface that brings together all the components so far to send a
request across the network

fix #6

Update the IPLD Bridge to take into account the new architecture around links

ReequestManager makes requests

Update to the latest architecture, remove private vars

fix #5

Handle failed request status codes from server and pass on errors

Cleanup request manager test to extract repeated code

Add a channel of asynchronous errors instead of only an initial synchronous one

Create a manager for outgoing requests

Provide selectors that will fail validation or encoding

Create a peer manager to manage message queues for peers

Create a message queue to pool messages for a single peer and send them

fix(network): remove buffer

Remove an unneccessary buffer based on an upstream fix - see bitswap/103