create-staked: add test

[smelc]

Changelog

- description: |
    This PR adds some tests to the create-staked command
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

• This PR adds some tests to create-staked, to be able to catch regressions in the list of files being generated and check a bit the content of the generated genesis.json file.
• Later on, we will port those tests to create-testenet-data (Add create-testnet-data command #488)

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[carbolymer]

What's the order of the files? If listDirectory does not give us any order
guarantees, it would be nice to sort the list to have consistency between filesystems.

[smelc]

@carbolymer> actually it's the caller that postprocesses the result of tree to make it stable, along with normalization and making it relative (to avoid depending on a temporary directory name) 👍

[Jimbo4350]

StandardCrypto is exposed via Cardano.Api.Ledger. If you find yourself reaching for things directly from the ledger repo, check that it's not already exposed via Cardano.Api.Ledger.

[smelc]

Thanks to this @Jimbo4350, I could avoid adding a dependency to cardano-ledger-core! Good catch 🙏