Example data and scripts not unified

[MedericFourmy]

There are 2 ways to download the "crackers" example:

• Manually as explained in the docs: https://agimus-project.github.io/happypose/cosypose/inference.html#3-download-the-example
  -> used for the run_inference_on_example.py script
• With the download script: python -m happypose.toolbox.utils.download --examples crackers_example
  -> used for tests

Those two have confusingly slightly different structures.

Should we remove one of them?
Or both and keep only the barbecue-sauce example?

[nim65s]

The structure of those examples (if we have multiple ones) should be unified.
I think using the script to download the data is better than providing manual instructions

[MedericFourmy]

I agree with both, it's even simpler to keep only the barbecue-sauce example that has a more complete set of data (bounding box detection, depth).