Port LDM Tutorials

[ericspod]

Addresses part of #1769.

Description

This updates the tutorials for LDM models and copies over the notebooks from the GenerativeModels repo. These notebooks have been checked, the 3D one has its code updated but cell outputs left as-is to save time so may need checking later. The MAISI tutorial was untouched but should be updated as well.

Checks

• Avoid including large-size files in the PR.
• Clean up long text outputs from code cells in the notebook.
• For security purposes, please check the contents and remove any sensitive info such as user names and private key.
• Ensure (1) hyperlinks and markdown anchors are working (2) use relative paths for tutorial repo files (3) put figure and graphs in the ./figure folder
• Notebook runs automatically ./runner.sh -t <path to .ipynb file>

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[Can-Zhao]

Thank you so much for the PR! May I ask if you have run the tutorials for LDM models, including the multi-gpu script? LGTM. Thank you!

[KumoLiu]

Hi @ericspod, please help remove the output from these cells to help resolve the ci issue.
https://github.com/Project-MONAI/tutorials/actions/runs/10357197347/job/28668716848?pr=1775

[KumoLiu]

Still one more place need to update: https://github.com/Project-MONAI/tutorials/actions/runs/10369757784/job/28706169443?pr=1775

[ericspod]

The guidelines should be met now, we should check that the max_epochs replacement is working and things aren't too slow.

[KumoLiu]

I find there are still one place in ldm need to be updated:
https://github.com/Project-MONAI/tutorials/blob/main/generation/3d_ldm/inference.py#L23

[KumoLiu]

cc @ericspod @Can-Zhao