[COG] Media type

[Even Rouault]

> Sidebar: I feel like "cloud-optimized geotiff" is pretty vague about the
> implementation and "cog" even more so. If this sub type were to be
> formalized, I'd hope we could come up with something more technically clear
> and less buzzy like "http optimized" or "direct access".

https://gdal.org/drivers/raster/cog.html#file-format-details
could serve as a base for this.

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