Add/review crs for TOPOWX data

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

• s3://mdmf/gdp/topowx_monthly.zarr
• s3://mdmf/gdp/topowx_normals.zarr
• s3://mdmf/gdp/topowx.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/topowx_monthly
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/topowx_normals
• https://cida.usgs.gov/thredds/catalog.html?dataset=cida.usgs.gov/topowx