Save only DRB data in a target for large CONUS downloads

[jds485]

This issue is to reduce the storage size of downloaded data in our repo. The plan based on our meeting is to combine 3 steps into one target that calls the existing functions for:

1. the fetch of the zipped file,
2. unzipping, and
3. clipping to DRB
4. [new step] deleting the zipped and unzipped files.

The new target would save the clipped dataset.

Examples: NADP and NLCD land cover datasets

[jds485]

Lauren suggests applying unzip and clip function to NADP and NLCD datasets

[jds485]

After #148, I think only NLCD datasets would need to be clipped

[jds485]

Also applies to road salt rasters

[jds485]

Total storage of these files is < 1 GB, so this is low priority