feat: Add input comparison validation command

[HCookie]

Description

Add a command line tool to validate / compare different input states

    model: /path/to/checkpoint.ckpt
    input:
      - mars
      - validation
    date:
      mars: "2024-01-01T00:00:00"
      validation: "2024-01-01T00:00:00"

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📚 Documentation preview 📚: https://anemoi-inference--462.org.readthedocs.build/en/462/