example: add mini camera sample rendering script

[AKilalours]

Summary

This PR adds a small example script for rendering camera samples from the nuScenes v1.0-mini dataset.

Why

New users often want a minimal script that loads the mini dataset, selects a sample, and renders the available camera views without needing to modify tutorial notebooks.

Changes

• Added render_mini_camera_samples.py
• Loads the v1.0-mini dataset by default
• Selects a sample by index
• Renders all available camera channels
• Saves rendered images to an output directory
• Prints useful sample and file metadata

Example

python python-sdk/nuscenes/scripts/render_mini_camera_samples.py \
    --dataroot /data/sets/nuscenes \
    --version v1.0-mini \
    --output-dir /tmp/nuscenes-mini-cameras

Testing

• Verified script imports successfully
• Documentation/example-only change
• Checked diff locally

[AKilalours]

Hi maintainers,

I opened this as a small example contribution to help new users render camera samples from the `v1.0-mini` dataset without modifying tutorial notebooks.

Happy to revise the file location, naming, or scope if you prefer a different structure.