Add/review crs for High-Resolution Precipitation Projections for the South Central U.S. data

Add (or review for accuracy if it already exists) crs information to High-Resolution Precipitation Projections for the South Central U.S. datasets, which likely have the same crs (but please check this):

• s3://mdmf/gdp/TTU_2019_rcp45_gridded_annual.zarr
• s3://mdmf/gdp/TTU_2019_rcp45_station_data.zarr
• s3://mdmf/gdp/TTU_2019_rcp45_time_slices.zarr
• s3://mdmf/gdp/TTU_2019_rcp85_gridded_annual.zarr
• s3://mdmf/gdp/TTU_2019_rcp85_station_data.zarr
• s3://mdmf/gdp/TTU_2019_rcp85_time_slices.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/TTU_2019/rcp45_gridded_annual_data
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/TTU_2019/rcp45_station_data
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/TTU_2019/rcp45_time_slices
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/TTU_2019/rcp85_gridded_annual_data
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/TTU_2019/rcp85_station_data
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/TTU_2019/rcp85_time_slices