Validate that geometry is fully contained in bounding volumes

One aspect of the validation of content data should be to check that geometry is fully contained in the relevant bounding volumes. This refers to `content.boundingVolume` and each `tile.boundingVolume` on the path from the tile that contains the geometry, up to the root.

Start by tracing the validator's content-data validation and how it handles content.boundingVolume and tile.boundingVolume. Implement checks that geometry is fully contained by the relevant volume and each volume on the path to the root; done means those containment cases are reported during validation.

Written by the indexing model from the issue text.