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Make the request manager actually inject responses from the network, and perform a selector
verification

Extract metadata encoding to a package and add a decoding feature

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

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

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

Provide selectors that will fail validation or encoding

Build a mock version of the IPLD bridge that we can use for testing for now