earthdata_search using geojson with POST

[alex-s-gardner]

Before I take a crack at this I wanted to see if you've already implemented a polygon geojson/shapefile granule search elsewhere?

[evetion]

I haven't, so feel free to try your hand at it. 👍

I would advise to use GeoInterface for this and replace the current NamedTuple interface with Extents.

[evetion]

Moved to EarthData.jl