Option to not unzip downloads?

[Aariq]

Would it be possible to include an option to not unzip files at all? It is possible to read in the zipped files without unzipping them, for example:

terra::rast("/vsizip/PRISM_tmean_early_4kmD2_20240312_bil.zip/PRISM_tmean_early_4kmD2_20240312_bil.bil")

This would save on disk space.

[rabutler-usbr]

I'm going to add this to a later version. It will require thinking through how all the prism_() and pd_() functions work if only zip files are present, and I want to get a new version out that provides access to the daily normals and solar radiation data.