Add notebooks for evaluating NWM predictions

[rajadain]

Overview

Adds notebooks, README for comparing NetCDF / Zarr / Kerchunk access of NWM Predictions Streamflow data.

Checklist

• [x] Documentation updated if needed
• [x] PR has a name that won't get you publicly shamed for vagueness

Closes #31 Closes #32 Closes #113 Closes #121 Closes #107 Closes #127

[review-notebook-app[bot]]

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