Add dreieck triangulation library

Dreieck is adding support for triangulation using monotone decomposition. This enables much faster triangulation of complex polygons while having a fallback to earcut for simpler polygons and also in case the triangulation fails (very weird case).

GitOrigin-RevId: c5debf4aea682c8931677e1fb10b146483f6d962

Author: jtorresfabra