feat(translator): use the shiny new rewritten GoBGP Protobufs and upgrade GoBGP

[crankynetmaam]

This upgrades us to the latest GoBGP version and uses the new protobufs (yay!) so we don't have to do the annoying manual packing of attributes.

Closes #212 and I think #214 because I'm happy (enough) with how this actually handles generating things with a real honest to god useful protobuf. It's at least more functional (and we just touch a init.py to seal the deal towards packagifying the grpc code. )

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[samoehlert]

This looks great and is a big win. Much clearer and more reliable with specific types.