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

Before submitting

• [x] Did you make sure title is self-explanatory and the description concisely explains the PR?
• [x] Did you make sure your PR does only one thing, instead of bundling different changes together?
• [ ] Did you list all the breaking changes introduced by this pull request?
• [x] Did you test your PR locally with pytest command?
• [ ] Did you run pre-commit hooks with pre-commit run -a command?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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   +/-   ##
=======================================
  Coverage   35.90%   35.90%           
=======================================
  Files          67       67           
  Lines        7419     7419           
=======================================
  Hits         2664     2664           
  Misses       4755     4755           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[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