Implement weighted random walks

[pbielak]

In the Node2vec paper, the transition probabilities are computed based on both edge weights and the hyperparameters p and q. The current implementation does not include the edge weights of a graph. This feature was already requested in #88 and #115. Based on the rejection sampling method used for the current implementation [1], I implemented a version that includes edge weights.

The PR for this feature implementation is #140

[1] https://louisabraham.github.io/articles/node2vec-sampling.html

[github-actions]

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