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Geometry Nodes: Curve Fill Node

This node takes a curve geometry input and creates a filled mesh at Z=0
using a constrained Delaunay triangulation algorithm. Because of the
choice of algorithm, the results should be higher quality than the
filling for 2D curve objects.

This commit adds an initial fairly simple version of the node, but more
features may be added in the future, like transferring attributes when
necessary, or an index attribute input to break up the calculations
into smaller chunks to improve performance.

Differential Revision: https://developer.blender.org/D11846