feat: Add into_edge_type for StableGraph#948
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This PR adds
.into_edge_type()forStableGraph- it just calls.into_edge_type()on the underlyingGraphdirectly.The use case is some code that requires switching between directed and undirected graphs often while keeping the same node indices. This was possible but quite inefficient with the current API because you have to copy over all of the nodes and edges into a new graph (and I think it may also invalidate the edge indices when doing so, although this wasn't important for my application).