Because the stacks wire format changed with nakamoto, we want to make sure that chainhook can process epoch 3.0 block.

• chainhook relies on clarinet/components/stacks-codec to process block
  • this component is duplicated (and slightly altered) code from stacks-core
    • in the future we'd like to simply re-use the code from stacks-core, but unlikely top happen before nakamoto
    • it's slightly outdated right now, but is good enough for clarinet
    • it's not straightforward to update (and it's not tested at all)
• I think we should test chainhook with the current version of stacks-codec on a testnet running in epoch 3.0.
• if something goes wrong, we'll be able to upgrade the stacks-codec

I could go ahead and just try to update the stacks-codec right now, but considering how sensitive it is, I'd rather do it only to fix something (or make sure I don't actually break anything)