Proof of concept for streamlines visualization

[pp-mo]

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[stephenworsley]

Experiments with PyVista streamlines functions suggest that it is possible to plot streamlines on the surface of the globe with streamlines_from_source if vectors are assigned to the points/nodes of a mesh which also has faces. To better support streamline plotting, it would therefore be worthwhile extending the work done in #676 on the Transform.from_points (which supports the creation of meshes of points) to the equivalent functions: Transform.from_1d, Transform.from_2d and Transform.from_unstructured (which support the creation of meshes with points and faces).

[github-actions]

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