PSCE-194 - Add create method to generate new system security plans with inheritance view

[jpower432]

Description

Type of change

Add create method on AuthoredSSP class to generate new system security plans with inheritance view

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this been tested?

• Unit tests
• Integration test
• Regression
  • Check Only - https://github.com/jpower432/cautious-potato/actions/runs/5838710714
  • Assemble - https://github.com/jpower432/cautious-potato/actions/runs/5838710710/job/15836057239
  • Regenerate/GitHub PR - https://github.com/jpower432/cautious-potato/actions/runs/5838749630/job/15836129269
  • Creation - https://github.com/jpower432/cautious-potato/actions/runs/5838776147

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules