Add notebook demonstrating how to create a STAC collection for a virtual icechunk store (#8)

This notebook is an improved version of: https://gist.github.com/jsignell/86236d7e5db70363f1c94a2ded0c2119 and demonstrates how to create a STAC Collection for a virtual icechunk store using the following extensions:

- [Zarr STAC Extension](https://github.com/stac-extensions/zarr)
- [Storage STAC Extension](https://github.com/stac-extensions/storage)
- [Datacube STAC Extension](https://github.com/stac-extensions/datacube)
- [Render STAC Extension](https://github.com/stac-extensions/render)
- [Virtual Assets STAC Extension](https://github.com/stac-extensions/virtual-assets)

If the bucket that stores the virtual icechunk or the chunks themselves were not publicly accessible then you could also use the [Authentication STAC Extension](https://github.com/stac-extensions/authentication) to specify how to access those buckets.

Author: jsignell