refactor(scripts): update system info script

[imstevenpmwork]

This updates the system info script and adds an entry point for ease
Every commit can be checked separately

$ lerobot-info

Copy-and-paste the text below in your GitHub issue and FILL OUT the last point.

- lerobot version: 0.3.4
- Platform: Linux-6.14.0-28-generic-x86_64-with-glibc2.39
- Python version: 3.10.18
- Huggingface Hub version: 0.35.1
- Datasets version: 4.1.1
- Numpy version: 2.2.6
- PyTorch version: 2.7.1+cu126
- Is PyTorch built with CUDA support?: True
- Cuda version: 12.6
- GPU model: NVIDIA GeForce RTX 4070 Laptop GPU
- Using GPU in script?: <fill in>