Add check-node-configuration command

[smelc]

Context

We want to add a check-node-configuration command to cardano-cli to validate the hashes of genesis files in the node's configuration file. This will remove some work from cardano-testnet, and at the same time providing support to users. This has been discussed on input-output-hk/cardano-node-wiki#52.

Design decisions

1. The command is in the debug top-level entry, because it is not dependent upon an era.
2. The command has an optional --fix flag that will correct the hashes if they are incorrect, or write them if they are missing. By default this option is OFF, because we want this command to be a checker first and foremost.
3. If a genesis hash is present, but the path to the genesis file is missing, the command doesn't fail, but issues a warning on stdout.
4. byron is handled, and this is a pain, because its handling is different, but 🤷

[smelc]

Work being done at https://github.com/IntersectMBO/cardano-cli/commits/smelc/check-node-config/