Add --pretty-print option for profile resolution output

[david-waltermire]

Summary

This PR adds a --pretty-print command-line option for the resolve-profile command, enabling formatted output for XML, JSON, and YAML files.

• Added PrettyPrinter utility class for formatting output files in various formats
• Added --pretty-print CLI option to AbstractResolveCommand
• Added unit tests for the PrettyPrinter utility
• Added CLI integration tests for pretty-print functionality

Attribution

This feature was originally contributed by Mahesh Kumar Gaddam (@ermahesh) in usnistgov/oscal-cli#295.

Related Issues

• Addresses usnistgov/oscal-cli#268

Test plan

• Unit tests for PrettyPrinter utility class (7 tests)
• CLI integration tests for --pretty-print option with XML, JSON, and YAML output (3 tests)
• All existing tests continue to pass

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/pretty-print-xml

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