Add a generate samples script

[QB3]

What does this PR do?

Add a script to generate multiple images for the CIFAR-10 examples

Fixes #73

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3c0cfdd) 35.90% compared to head (6562e19) 35.90%.

❗ Current head 6562e19 differs from pull request most recent head c41f83d. Consider uploading reports for the commit c41f83d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
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  Coverage   35.90%   35.90%           
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  Files          67       67           
  Lines        7419     7419           
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  Hits         2664     2664           
  Misses       4755     4755           

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[QB3]

Since the generation might be time-consuming, we could also try to add a multi-GPU support.
I took a look at this script https://github.com/NVlabs/edm/blob/main/generate.py but it is unclear how to do it