Resolve "Add/review crs for flet data"

Closes #70 (closed)

CRS (Lambert Conformal Conic) present and confirmed.

• Replaced misspelled 'grid_mappting_name' with 'grid_mapping_name' for both zarr files.
• To run metpy.parse_cf() on these datasets, subset the data to only include variables with the (time, lat, lon) dimensions. If you don't, the following error will occur: conflicting values for variable 'metpy_crs' on objects to be combined. You can skip this check by specifying compat='override'.