[FEA]: Add API Calls to Get Edge Types and Edge Counts for cuGraph.Graph

[alexbarghi-nv]

Is this a new feature, an improvement, or a change to existing functionality?

New Feature

How would you describe the priority of this feature request

High

Please provide a clear description of problem this feature solves

cuGraph now supports edge types, but using them requires a lot of repeated code. This code should be consolidated in a new API call that matches the equivalent property graph call (G.vertex_types) and another new API call (G.get_num_edges()).

This was originally going to be part of #2832 but requires additional tests.

Describe your ideal solution

@property
def vertex_types(self):
           if self.edgeTypeCol in self.edgelist.edgelist_df.columns:
                return (
                    self.edgelist.edgelist_df[G.edgeTypeCol]
                    .unique()
                    .astype("str")
                    .values_host
                )
            else:
                return [""]

def get_num_edges(self, edge_type=None):
                mask = self.edgelist.edgelist_df[self.edgeTypeCol] == edge_type
                return self.edgelist.edgelist_df[mask].count()

Describe any alternatives you have considered

No response

Additional context

No response

Code of Conduct

• I agree to follow cuGraph's Code of Conduct
• I have searched the open feature requests and have found no duplicates for this feature request

[alexbarghi-nv]

no longer desired behavior