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Remove gx, add go mod for now.

Chore/update message format 15

feat(network): first version of GraphSyncNetwork

Implementation of GraphSyncMessage

Update to finalized protobuf format.
Also remove deprecated selector interface which is out of date

testutils will be general, so move them

It's getting to painful to also maintain images. They can instead be generated on demand

Add a ConnectTo method to the network layer to create connections

setup GraphSyncNetwork interfaces and provide an implementation based on libp2p.host

fix #1

correction to diagram, protobuff, and remove test function not needed

Add ToNet and FromNet functions that read/write to an io stream for use in network. Also type
response codes

Use a Cid as a root instead of a node, so that only one round trip is neccesary

Initial implementation of graph sync messages including protobuf struct and
serialization/deserialization

fix #2 fix #3

Initial commit with skeleton readme and architecture diagrams to date