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When the request manager receives extensions in a request, it processes them and returns their
response

This reverts commit e8245a51, reversing
changes made to 2cbb73ff.

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.

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

Updates IPLD Bridge to use latest go-ipld-prime and runs and actual round trip test using GraphSync,
go-ipld-prime, and real selectors

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