[Documentation] Guides on passing custom classes into the Simulation object

The simulation object can take various user-provided classes. Coming up with example cases and putting them in the documentation would help with the discoverability of these features.

<img width="694" height="371" alt="Image" src="https://github.com/user-attachments/assets/469907d5-6040-44ed-ba42-39cc160cb629" />