Add new GeoGridAggregation base on H3 hexagonal grid

[iverase]

H3 is a grid system that partitions the earth using mainly hexagons. It has very nice properties which make it suitable for machine learning algorithms. In addition it can be used for render data which provides a smother look due to the more round aspect that using squares.

Squares:

Hexagons:

Here are the tasks:

• Port H3 basic functionality to java Java port of H3 hexagonal grid library #81714
• Implement GeoHexGridAggregation New GeoHexGrid aggregation #82924
• Integrate the aggregation in the vector tiles API Integrate GeoHexGridAggregation with vector tiles API #84553

relates to #16895

[elasticmachine]

Pinging @elastic/es-analytics-geo (Team:Analytics)