Implement what we can, wrap what we can't

[asinghvi17]

We should add a method GEOS() to nearly every method here, which literally just calls LibGEOS.(...) so that we can expose a correct and working example of the feature. This would be huge for adoption, since the GO interface is a lot more Julian and easy to use (plus accepts more types) than LG!

[asinghvi17]

DelaunayTriangulation.jl already has a Graham scan algorithm for complex hull which we could hook into: https://github.com/JuliaGeometry/DelaunayTriangulation.jl/blob/ab58263640fc02e84053e5cc5e33a0fdc21d4fc7/src/data_structures/convex_hull.jl#L36-L43

[asinghvi17]

This is probably understood pretty well by now, closing