Investigate making Cartopy (and therefore Matplotlib) an optional dependency #6839
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Description
Not all Iris users need to plot. However we currently also depend on Cartopy for coordinate systems, so this issue is dependent on #4643.
- Complete Adopt pyproj.CRS #4643
- Complete any other necessary steps to remove Cartopy from Iris core functionality
- Adopt the optional dependency patterns for Cartopy
- Unit versus Integration testing
- Dependency listing
- User warning