Refactor tests to new cucumber syntax and add parser tests

[bglw]

Highlights:

• Uses new cucumber API
• Moved PagebreakState.page_items into an Rc<RefCell<>> to make clippy happy
  • The previous remaining_items.drain(0..max_count).collect() angered clippy with it's redundant allocation
  • Rc<RefCell<>> is so we can drain the Vec into the closure where we mutate PagebreakState
• Implemented parser-based step definitions using Kuchiki
  • Resolves Add parser based tests to cucumber runner #16
• Github action testing

[Tate-CC]

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