Create example notebooks which use AWS open data and Cellxgene Census APIs

[keller-mark]

Example which uses data from S3 bucket directly

See https://registry.opendata.aws/czi-cellxgene-census/ and https://aws.amazon.com/marketplace/pp/prodview-kxcabxfdlze7k?sr=0-1&ref_=beagle&applicationId=AWSMPContessa#resources

Clicking View Resources on the second link allows viewing the S3 bucket contents. We could demonstrate usage of Vitessce with these H5AD files (similar to this example https://github.com/vitessce/vitessce-python/blob/main/docs/notebooks/widget_brain_h5ad.ipynb) - screenshots at the end of the issue

Example which uses Cellxgene Census APIs

In addition to an example which uses the S3 bucket from AWS Open Data directly, we should add examples which use the Cellxgene Census Python API to request data, then visualize the results using Vitessce in a Jupyter notebook.

• Spatial tutorial
• get_anndata function example

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