wip: Create reprojector mesh initial conditions from delaunator

[kylebarron]

I'm not exactly sure yet, but I have the feeling that it may be useful to construct a delatin instance from an existing delaunay triangulation, such as when rendering non-rectilinear Zarr datasets.

I was reading through https://mapbox.github.io/delaunator/ and realized it might be trivial to create the initial conditions required for delatin from an existing delaunay triangulation.

• Should work with delaunator and Constrainautor out of the box.

  • This assumes that the layout of coords and halfedges match between delatin and delaunator, which is probably true, but we still need to verify.

• What's the best way to provide two different constructors? We want one constructor that initializes a mesh from a height and width, and another constructor that initializes a mesh from an existing triangulation?