Add stable diffusion integration

[xzdandy]

Reopen the #1111.

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[xzdandy]

Quick notice:

1. Fix testcases
2. Please change the notebook name and if notebook also does not work on circle ci, we can skip the it. You can do it in script/test/test.sh. Do let us know why it does not work.
3. Add a documentation to the function under https://evadb.readthedocs.io/en/stable/source/reference/ai/index.html
4. Both test/integration_tests/long/functions/test_dalle.py and test/integration_tests/long/functions/test_selfdiffusion.py look unit tests instead of long integration tests, which is fine. If so, move them to test/unit_tests.

[xzdandy]

Hi @sudoboi, I do not have permission to push to your fork since I am not the reviewer. We need to change the script/test/test.sh to skip the tutorials/18-stable-diffusion.ipynb due to the replicate API key. Overall looks great! Thanks!

[xzdandy]

Hi @gaurav274 and @jiashenC, please help review the PR. The PR looks good to me. But I reopened the PR, so I can not approve.