Improve GNN4ITk pipeline
Add new functionality to ExaTrkX utilities:
- add namespace for all ExaTrkX utility functions,
- improve the brutal-force search for fixed radius nearest neighbors (
buildEdges
), - add the CCandWalk algorithm that does the connected component and walk through algorithms for graph segmentation,
Improve the TrackFinderTool based on the Metric-Learning-based GNN4ITk pipeline.