Add comprehensive Parameter Store documentation for Java core

[devin-ai-integration]

Parameter Store Documentation for Java Core

This PR adds comprehensive documentation for the Parameter Store APIs in the Java core. The documentation provides:

• Clear explanation of what Parameter Store is and its purpose
• Detailed examples for retrieving different types of parameters (string, boolean, numeric, complex)
• A complete working example showing Parameter Store in action
• Best practices for using Parameter Store effectively

Testing

Verified the documentation formatting and examples for correctness.

Link to Devin run: https://app.devin.ai/sessions/2dece3070d4948c2ab3849d736c4ce25
Requested by: [email protected]

[devin-ai-integration]

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[jasonwzm]

🚀 Deployed on https://6807c81807fd5e107f1676b4--cozy-fox-0defec.netlify.app

[weihao-statsig]

This is great, but it's a little bit too comprehensive, can you simply a little bit?

Also, I'd like to make this part under Working with statsig as a small title