Implement YStripesPointInAreaLocator

[micycle1]

A faster point-in-area locator.

• Uses the technique described here: https://github.com/tidwall/tg/blob/main/docs/POLYGON_INDEXING.md#ystripes
• Faster than IndexedPointInAreaLocator (4x+ in my various tests).
• Passes all AbstractPointInRingTest tests.

It's packaged such that the core polygon algo (YStripesPointInPolygonLocator) is defined in its own non-public class, then the Area variant constructs PolygonLocators for each Polygon in a Geometry, indexed via an STRtree.

The name could be changed too. Of course this too is an indexed PointInAreaLocator, but that exact name is taken.