Improve splitter

[tyrasd]

Makes use of LazyEvaluatedObjects and PreparedGeometrys to improve performance of geometry splitter (used in aggreateByGeometry queries):

• use PreparedGeometry.intersects to reduce expensive intersection calls
  • todo: can this optimization be applied in the "regular" cell-iterator also?
• use LazyEvaluatedObject to avoid expensive calculations of intersections when they might not get used after all.

Checklist

• My code follows the code-style rules and I have checked on the static analyses and benchmark (if applicable) results
• I have commented my code
• I have written javadoc (required for public methods)
• I have added sufficient unit tests
• I have made corresponding changes to the documentation
• I have updated the CHANGELOG.md
• I have adjusted the examples and benchmark if necessary

[joker234]

todo: can this optimization be applied in the "regular" cell-iterator also?

What happens with this todo? Is there already an issue for that, if necessary?

[tyrasd]

todo: can this optimization be applied in the "regular" cell-iterator also?

What happens with this todo? Is there already an issue for that, if necessary?

-> #289