Refactor: Network notifications

[bgins]

Summary

Our network notifications take an intermediate step by converting to primitive types before converting to IPLD.

Impact

Performance cost and some added complexity.

Solution

Remove the intermediate representations.

Detail

This refactor will require that we can reconstitute libp2p data structures from IPLD. We should investigate where this is possible, but we could partially refactor even if it is not possible in all cases.

Note that this would also require updates to JSON Schemas to report the serialized types that clients should expect.