Expose Edge Types

[cadop]

Edge type for step etc. is not exposed in C API.

EdgeSet is using intedge, which is 'lightweight', probably for performance. If performance isn't too bad, include an edgeset with cost type stored. Doesn't need to be returned with graph, but should act like a custom attribute or energy expenditure for query on an edge id.

• [ ] Expose API for Getting Edge data https://github.com/cadop/dhart/blob/7ce7a6a84c33dd2c0dbd85effdc380f02cac08d9/src/Cinterface/spatialstructures_C.cpp#L66
• [ ] Follow similar style for energyexpenditure to add custom edge attributes https://github.com/cadop/dhart/blob/4532b544a0e67e46c0077105019916a7ab378fab/src/Cinterface/spatialstructures_C.cpp#L395
• [ ] Add method or overload for getting step type after the graph generator. Either add a toggle for the edge type to be recorded or overload with new method https://github.com/cadop/dhart/blob/4532b544a0e67e46c0077105019916a7ab378fab/src/Cpp/spatialstructures/src/Edge.h#L31
• [ ] create edge struct for interfaces. mimic node example https://github.com/cadop/dhart/blob/4532b544a0e67e46c0077105019916a7ab378fab/src/Python/dhart/spatialstructures/node.py#L10