MAISI VAE transforms

[Can-Zhao]

Fixes # .

Description

MAISI VAE transforms

Checks

• [x] Avoid including large-size files in the PR.
• [x] Clean up long text outputs from code cells in the notebook.
• [x] For security purposes, please check the contents and remove any sensitive info such as user names and private key.
• [x] 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>

[Can-Zhao]

Thanks for the pr. It seems that this PR contains a variety of transform list dependent on mri or ct, and if it's only specific in vae training, I feel that we don't need not define classes or functions for these transforms separately. But if others don't have comments, we can do that in the first version.

Yes, multi-modal training is used only for VAE for now. It might be used for diffusion model in the future.