Port Turf.hex-grid to java

[osanchik]

Make Turf's hex-grid function be available in java. Hex-grid utility will return a Feature Collection of hexagons or triangles based on a bounding box and the diameter of the cell. This is will enable to do a HeatMap demo in the android-demo-app.

Here is more information about hex-grid: https://github.com/Turfjs/turf/tree/master/packages/turf-hex-grid

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

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This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.

[langsmith]

Re-opening because this would be good to have. I've seen hex grids more in more in rudimentary data visualizations. For example, the Postmates delivery app is using hex grids.

[stale[bot]]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.