Add/review crs for puerto_rico data

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

• s3://mdmf/gdp/NHM_CCSM4_monthly.zarr
• s3://mdmf/gdp/NHM_CCSM4_daily.zarr
• s3://mdmf/gdp/NHM_CCSM4_hourly.zarr
• s3://mdmf/gdp/NHM_GFDL_monthly.zarr
• s3://mdmf/gdp/NHM_GFDL_daily.zarr
• s3://mdmf/gdp/NHM_GFDL_hourly.zarr
• s3://mdmf/gdp/RSM_CCSM4_daily.zarr
• s3://mdmf/gdp/RSM_GFDL_daily.zarr

I do not have the THREDDS catalog endpoints for these, but I could try to get them if you need them.