Tutorial on burn scar analysis using embeddings from partial inputs

[yellowcap]

This PR adds a tutorial on Burn scar analysis using embeddings from partial inputs

This notebook contains a complete example for how to run Clay. It combines the following three different aspects

1. Create single-chip datacubes with time series data for a location and a date range
2. Run the model with partial inputs, in this case RGB + NIR
3. Study burn scares through the embeddings generated for that datacube

Closes #126 Closes #136

[lillythomas]

This looks great @yellowcap good to see how you plotted the dates directly from the stack. That works well for single component scenarios, which should be largely sufficient for many stories. More complex ones might require somehting like what I did where I added the non-normalized dates to the batches such that embeddings can be labeled with dates in the plots.

Signal of the burn scars is clear. This looks good to merge. I'll incorporate some takeaways from this into my PR.