[debug]Graph Util function

[KUcyans]

The function gather_cluster_sequence is used to cluster the data that have the same combination of values in the selected column(s).

• The previous implementation works only for the column selection starting from index 0.
• Now a user can use any column indices for the clustering.
  • the indices don't have to start with 0
• The variable name has changed from sort_this to contingency_table for the sake of readability

[KUcyans]

I changed the argument for numpy arange to make cluster_columns_contingency_table

[RasmusOrsoe]

@KUcyans Black will automatically format these things for you locally when you commit. Consider installing pre-commit - it will save you a lot of time. More info here: https://graphnet-team.github.io/graphnet/contribute/contribute.html#code-quality

[KUcyans]

@RasmusOrsoe I finally know I should have run pre-commit before I finalise my changes. This integration system is very advanced and cool to me. Thanks for letting me know.

[RasmusOrsoe]

🚀 thanks for this clean contribution @KUcyans