PackedCoordinateSequence separated arrays variant #672
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This PR implements a third variant of the PackedCoordinateSequence implementations named Double2 for lack of a better name.
This variant explicitly uses three arrays (XY, Z and M respectively) instead of a stride based single array as the other two implementations do.
The motivation of adding this variant is to support a more direct and efficient way to interop with memory models of this layout. Popular examples of this memory model are GDAL and QGIS. It's also the memory model I chose for my own FlatGeobuf format and is the main reason for me wanting this (to be able to more efficiently use FlatGeobuf with JTS or ports of it).