Added
- **StateBuilder** and **SegmentProps**: A new parameter for segment properties will create columns with a random number for you in a segment property, useful for sampling large lists of ids in neuroglancer.
- **StateBuilder**: Made it so that `site_utils` configuration can be accessed from `statebuilder.site_utils` instead of needing a separate import.
Fixed
- **StateBuilder**: Updated helpers to be compatible with new site_utils functionality.