Add/review crs for WUS_HSP data

Add (or review for accuracy if it already exists) crs information to WUS_HSP datasets, which likely have the same crs (but please check this):

• s3://mdmf/gdp/WUS_HSP/historical.zarr
• s3://mdmf/gdp/WUS_HSP/SD_A1B_2040s.zarr
• s3://mdmf/gdp/WUS_HSP/SD_A1B_2080s.zarr
• s3://mdmf/gdp/WUS_HSP/WRF_1980s_echam5.zarr
• s3://mdmf/gdp/WUS_HSP/WRF_A1B_2020s_echam5.zarr
• s3://mdmf/gdp/WUS_HSP/WRF_A1B_2050s_echam5.zarr

They have the following THREDDS catalog entries, if that is helpful to have:

• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/historical
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/SD_A1B_2040s
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/SD_A1B_2080s
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/WRF_1980s_echam5
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/WRF_A1B_echam5_2020s
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/thredds/WUS_HSP/WRF_A1B_echam5_2050s