Write data access for MRMS data

[tdunning]

Write python code that

• on startup, reads data file meta-data for all of the last 100 days (possibly just uses deterministic mapping)
• on startup, reads grid point mapping file

A query will give a single lat/long. We need a function that:

• finds the nearest grid point using larger and larger searches from the query point
• finds the daily data for that grid point

A second query will give a center point (in lat/lon) and a radius in km. We need a function that:

• finds all grid points within that radius of the specified point
• finds the daily data for that grid point

Links

https://github.com/agstack/weather-server/tree/main/experiments/s2-geohash
https://arrow.apache.org/docs/python/