Implement `sudo` mode tooling for testing

[aubrika]

We should have the ability for a Penumbra node to fork and then simulate the as close to the exact state of a given network as possible.

Penumbra's support for consensus key rotation makes this possible: we can implement tooling in a pd subcommand, e.g., pd sudo-fork, that:

• does a custom migration-like (not an actual migration but implemented using the same in-place edit functionality) operation editing all of the validator definitions to have new consensus keys
• this should also overwrite the cometbft data describing the validator set, which may or may not require surgery
• copies the resulting data to make a clone of all active validators
• generates Docker config data for running all those clones in a single docker-compose operation

[hdevalence]

We should implement a basic upgrade smoke-test first, and aim to do this more complex simulation capability post-mainnet.