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Add support for full containment and overlapping modes in polygonToCellsExperimental (#796)

Adds support for full containment mode and overlapping modes in polygonToCellsExperimental.

* Defines an enum for the containment modes. My assumption here is that the lowest 4 bits of the 32-bit flag are reserved for containment modes (not sure that we'd need more than 7, but wanted to be on the safe side), and that we'd use them as an integer, not as bitwise flags, since the modes are mutually exclusive.
* Implements the check for containment in iterStepPolygonCompact. This was very straightforward as we already have cellBoundaryInsidePolygon polygon available.
* Implements the check for overlapping cells in iterStepPolygonCompact. This checks center point inclusion first, then shares code with the full containment check, substituting a new cellBoundaryCrossesPolygon check for cellBoundaryInsidePolygon.

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