Add QDHF tutorial

[ld-ing]

Description

Add a tutorial that uses Quality Diversity through Human Feedback (QDHF) to improve the diversity of Stable Diffusion image generations. The tutorial showcases how people can do QD optimization without manually crafted diversity metrics. It also extends the previous DQD tutorial with an LSI pipeline using Stable Diffusion.

TODO

• [ ] Polish the content.
• [ ] Make the tutorial show up on the website.
• [ ] Test if it runs on Colab and local machines.
• [ ] Make tests pass for this tutorial.

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] I have added a one-line description of my change to the changelog in HISTORY.md
• [ ] This PR is ready to go