feat: Integrate YarnSpinner into dialogue system module

[Bli-AIk]

🔗 Is your feature request related to a specific issue?

To maximize flexibility, the framework should not be limited to a single narrative tool. Yarn Spinner is another very popular and powerful open-source choice for creating interactive dialogue, especially favored for its human-readable syntax.

---

💡 Feature Description

Create an integration layer for Yarn Spinner, allowing it to serve as an alternative narrative backend to Ink.

• Expected outcome or effect: The ability for developers to write and execute narrative content in Yarn Spinner's .yarn format.
• Specific implementation ideas: The following definitions are for reference only and are subject to change. Implementation could include:
  • A YarnPlayer class that can load, compile, and run Yarn Spinner projects.
  • Implement a DialogueRunner that connects the Yarn runtime to the UI and other game systems.
  • Similar to the Ink integration, create a bridge for two-way communication with the Fact and Event systems. This includes:
    • Exposing custom commands in Yarn (<<command>>) to fire game events.
    • Exposing custom functions to query the Fact database (if has_item("key")).
• Usage scenarios or benefits: This provides flexibility and choice for the development team, allowing writers to use the tool they are most comfortable with without requiring changes to the core game logic.

---

⚖ Alternatives Considered

N/A

---

📝 Additional Information

The official Yarn Spinner C# libraries will be used as the core runtime. The work is primarily in creating the "glue" that connects it to the Lunar framework systems.