Setup and investigate consistent cbor encoding/decoding

[austinabell]

Discover how we can consistently encode and decode structs to cbor, and find out if this cbor encoded data would be transfered over the wire to other client implementations to have to match the cbor format for all types.

If a generic encoding and decoding cannot be used, explore standardizing this in a library to be used within the codebase.

[ansermino]

Indicated that we should use this: https://github.com/pyfisch/cbor/pull/164/files

[ansermino]

Some things that might be of interest:
https://github.com/filecoin-project/go-filecoin/tree/e81d26c47cc3f205d433ff3ea408c60364bec6dd/internal/pkg/encoding

https://github.com/ipfs/go-ipld-cbor/blob/e249008b68731703a093b723253be5175d518ed0/node.go#L400

[amerameen]

Can we update this based on #59? Or close it and open a new one?

[ansermino]

We need to establish a way to achieve consistent encoding/decoding and perform tagging.