surpriseMePolygon and createRegularPolygon in test util class returns invalid polygon

[heemin32]

Description

https://github.com/apache/lucene/blob/main/lucene/test-framework/src/java/org/apache/lucene/tests/geo/ShapeTestUtil.java

surpriseMePolygon and createRegularPolygon returns invalid polygon where three or more points having same value due to type casting from double to float.

Version and environment details

No response

[stefanvodita]

What happens with createRegularPolygon is very interesting. The smaller the polygon's radius is and the more vertices it has, the smaller the sides are. At some point they get so small, they can't fit on a float. I opened a PR which should fix the issue.

For surpriseMePolygon, the problem appears when we have a center with large coordinates and a small radius. The radius is too small to register when doing arithmetic with the center's coordinates. I added a retry mechanism.

There are other problems that I have to think about more, maybe in a separate PR. For example, what about large coordinates for createRegularPolygon? What about the case when the centers are at FLOAT_MAX? Then the radius becomes 0.

[stefanvodita]

Another edge case that can cause problems is that of multiple points on the same line (e.g. 3 points in a row with the same x coordinate). This happens for regular and for "surprise" polygons.