Draft: Implement GetFaceMaximalOuterRing function

Sandro Santilli requested to merge strk/postgis:getFaceExteriorRing into master

The idea of this function was for it to be faster than ST_ExteriorRing(ST_GetFaceGeometry(...)) but up to this point the code is actually slower, so doesn't make sense to merge as-is.

The only case in which this code is faster is when the subject face has a lot of holes, but we can't tell in advance so there's no way for us to decide whether to go with one or the other implementation.

Edited by Sandro Santilli

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