Merge pull request #321 from input-output-hk/dependabot/github_actions/actions/setup-python-6
chore(deps): bump actions/setup-python from 5 to 6
chore(deps): bump actions/setup-python from 5 to 6
feat(key): add mnemonic generation and key derivation
Add support for generating mnemonics and deriving extended signing keys from mnemonic sentences. Introduce KeyType and OutputFormat enums. Refactor helpers for file reading. Update KeyGroup with new methods for mnemonic and key derivation.