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.

まず、docs/turf-port.md にある Java Turf ライブラリの未サポート項目を確認し、要求されている動作を Turf の lineIntersect ドキュメントと比較します。ルート線と道路線の間の交点を検出して座標ペアを返す機能を追加し、その後、代表的な線形ジオメトリに対して結果の動作を検証します。