Improve docstring for data generator

[jiwoncpark]

The directory structure we have in mind is helio-ai ---data/ ------generate_Y_segmented_maps.py ------generate_Y_annotations.py ------data_utils/ ---------download_sharp_data.py ---------visualize_data.py where generate_Y_segmented_maps.py will import modules from download_sharp_data.py.

• [x] Separate out scripts/modules
• [ ] Add numpydoc docstring into all the scripts/modules
• [ ] Refactor to get a function in download_sharp_data.py that fetches the SHARP data and another that creates the Y_metadata Pandas dataframe.
• [x] Add script for generating the dictionary, generate_Y_annotation.py.
• [x] Delete extraneous notebooks
• [ ] Separate out video generating function and place it in visualize_data.py.

[jiwoncpark]

We're varying 3 main things in the dataset: whether X/Y are cropped (yes or no), how the AR shape is parameterized (circle, ellipse, bitmap), and the resolution (256 vs. 512). So we name output directories like Y_masks_uncropped_circle_res256.