[FEATURE] SDK helpers for multimodal workflows with Collections

[ramkumarkoppu]

Confirmation of Request Source

• I confirm that this feature request is for the xAI SDK Python library (e.g., client features, SDK methods, or documentation) and not for the xAI API itself (e.g., model capabilities or API changes).

Describe the feature you'd like

Add SDK convenience methods for common multimodal patterns:

1. Helper to store text + local image path reference together
2. Utility to reconstruct image paths from search results
3. Example code for vision + collections workflows

This would help developers working around the current text-only
Collections limitation until the API supports image storage natively.

Additional Context

No response