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Add the DSatur graph coloring algorithm as a new heuristic option for the igraph vertex coloring greedy()…

Add the DSatur graph coloring algorithm as a new heuristic option for the igraph vertex coloring greedy()…: a task in LegoFlow-SWE (Harbor dataset). The task is to add a new enum value IGRAPH COLORING GREEDY DSATUR that can be passed as the heuristic parameter to igraph vertex coloring greedy() …

The task

The task is to add a new enum value `IGRAPH_COLORING_GREEDY_DSATUR` that can be passed as the `heuristic` parameter to `igraph_vertex_coloring_greedy()`. When this heuristic is requested, the implementation must follow the DSatur selection rule described above.

Part of Lego-X/LegoFlow-SWE.