examples: define 'sample_data' for all examples #2044
Merged
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Ever since 297e1cb (Moving sample_data imports out of cartopy
namespace., 2020-07-23), some examples are not self-contained since they
want to import 'sample_data' from a non-existing module like 'waves' or
'arrows'.
Add the required 'sample_data' function to make all examples
self-contained. For 'contour_labels.py' and 'contour_transforms.py', the
function is copied from 'waves.py'. For 'barbs.py' and 'streamplot.py',
the function is copied from 'arrows.py'.
Rationale
Make all examples self-contained.
Implications
Examples can be downloaded and ran individually.