Enumerates the type of topology that makes up a UtilityTier definition.
UtilityTierType can be one of:
|UtilityTierType::Hierarchical (1)||A radial network. Edges and junctions spread out radially from a single source.|
|UtilityTierType::Partitioned (2)||A mesh network. Edges and junctions are connected to multiple sources in an interconnected lattice.|