Add support for turf-line-intersect

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Expected Behavior

I want to detect which roads intersect the route line I've drawn on the map and the coordinate pairs for these intersections.

Current Behavior

Currently there is no way to do this that's doesn't require a lot customer math on the part of the developer. This is because our Java Turf library does not support turf-line-intersect.

Possible Implementation

Porting Turf's lineIntersect would be the most consistent, straightforward way to handle the above use case.

Start by reviewing the Java Turf library's unsupported entries in docs/turf-port.md and compare the requested behavior with Turf's lineIntersect documentation. Add support for detecting intersections between route and road lines and returning their coordinate pairs, then verify the resulting behavior against representative line geometries.