Add maisi mask aug example (#1748)

Fixes # .

### Description
Add notebook example for tumor mask augmentation.

### Checks
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [ ] 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>`

---------

Signed-off-by: Pengfei Guo <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: YunLiu <[email protected]>

Author: 3 people

generative/maisi/data/mask_augmentation_example.ipynb

@@ -77,6 +77,7 @@ doesnt_contain_max_epochs=("${doesnt_contain_max_epochs[@]}" 02_mednist_classifi
 doesnt_contain_max_epochs=("${doesnt_contain_max_epochs[@]}" 03_mednist_classification_v2.ipynb)
 doesnt_contain_max_epochs=("${doesnt_contain_max_epochs[@]}" 04_integrating_code.ipynb)
 doesnt_contain_max_epochs=("${doesnt_contain_max_epochs[@]}" bending_energy_diffusion_loss_notes.ipynb)
+doesnt_contain_max_epochs=("${doesnt_contain_max_epochs[@]}" mask_augmentation_example.ipynb)
 
 # Execution of the notebook in these folders / with the filename cannot be automated
 skip_run_papermill=()