Opaque tokens

[jonbarrow]

Resolves #107 and #108

Changes:

Moves tokens to random data instead of storing the data directly. Trying to fit all the data inside the token was a losing battle because of how space-limited it all ways. This removes clients abilities to handle data entirely locally, but that's fine since it's only a single network hop. I made the tokens be the length of what they are from the official sources, despite the fact that some can sometimes be bigger, just to keep things simple

Marking as a draft because this isn't finished. The entire gRPC side needs to be done, which relies on PretendoNetwork/grpc#10 being merged. Also for gRPC, I think we should just ditch the v1 implementation entirely since it's token handling is fundementally incomaptible with this new handling. Just cut our losses there

• I have read and agreed to the Code of Conduct.
• I have read and complied with the contributing guidelines.
• What I'm implementing was an approved issue.
• I have tested all of my changes.

[mrjvs]

I haven't checked token sizes in my review, will possibly need to be checked by someone else