Add overload to build network from CSV edge list

Summary

Add an overloaded generateHomophilicNetwork(...) method that constructs the network from a CSV file containing edge definitions (i.e., with columns from,to). This complements the existing comparator-based homophilic generator by enabling deterministic graph construction from data.

Motivation

• Enable reproducible experiments by loading precomputed edge lists.
• Allow benchmarking and A/B comparisons against the current homophily-based generator.
• Facilitate integration with external pipelines that output edge lists.