Improve treqs-ng interface

User Story

As a developer, I want a stable outward interface for treqs-ng so I can reduce coupling when using it

Notes

• Related treqs-ng issue: https://gitlab.com/treqs-on-git/treqs-ng/-/issues/83
• Changes
  • Expose
    • treqs check
    • expose list_elements_strategy
  • Remove sys.exit

Traceability

• Related to: #
• T-Reqs ID:
• Requirement label:

Acceptance criteria

• Listed desired changes
• Created desired interface
• Created issue in Treqs-NG
• Adds args by name