3D Tiles Inspector: report geometric error for each tile

[pjcozzi]

@austinEng can you look at this before we start the skipping LODs optimization?

Use LabelCollection to display the geometric error for each tile. Perhaps draw at the approximate corner of the tile's bounding box/region/sphere.

This will be useful for us to evaluate tilesets, e.g., sometimes the geometric error is just wrong or increases too incrementally from parent to child tile.

CC #3241

[hpinkos]

Fixed in #5017