fix(catalog-to-csv): write one statement per CSV row

[michaeldavie-amzn]

Types of changes

• Hot fix (emergency fix and release)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (change which affects the documentation site)
• Breaking change (fix or feature that would cause existing functionality to change)
• Release (develop -> main)

Quality assurance (all should be covered).

• My code follows the code style of this project.
• Documentation for my change is up to date?
• My PR meets testing requirements.
• All new and existing tests passed.
• All commits are signed-off.

Summary

Modifies the statement level output of the oscal-catalog-to-csv task to output one row for each statement, to an arbitrary depth of sub-statements.

Key links:

• Sonar coverage

Before you merge

• Ensure it is a 'squash commit' if not a release.
• Ensure CI is currently passing
• Check sonar. If you are working for a fork a maintainer will reach out, if required.

[degenaro]

Sorry for the delayed response, I was OOO until today. I enabled workflow runs...

Existing tests will continue to succeed with respect to this trestle task? Please add to the test cases to cover the new functionality. Should the one statement per csv row be optional or always?