clovers BVHNode improvements

see https://github.com/Walther/clovers/issues/105
additionally, think about other possible improvements for BVHNode
e.g. spatial / octree building instead of choosing a random axis per node split
e.g. consider other structures than binary tree; e.g. B-tree, Finger tree, others
inspect the built tree for possible pathological cases, e.g. get debug printouts of how the tree got built
think about what a "sensible" tree would look like: balanced? unbalanced? spatially correlated? dense near objects?
other possible replacements, e.g. bounding interval hierarchy ?

Sep 02 '21 11:09 Walther

BVHNode splitting done by longest axis instead of random axis done in #140

May 30 '22 22:05 Walther

Alternative: https://pbr-book.org/3ed-2018/Primitives_and_Intersection_Acceleration/Kd-Tree_Accelerator

Jun 06 '22 11:06 Walther

Look into modern papers and blogs!

Add statistics methods for inspecting the "quality" of the constructed BVH.

Jun 13 '24 13:06 Walther

First set of improvements done in #208. Closing as complete - future improvements can be done as separate tickets.

Jul 28 '24 10:07 Walther