Explain: SubgraphXExplainer Algorithm

[February24-Lee]

Continued working on https://github.com/pyg-team/pytorch_geometric/pull/6236

Main updates:

• Handled comment section of https://github.com/pyg-team/pytorch_geometric/pull/6236
• Updated all uses of networkx to pytorch geometric.
• Cleaned up other unnecessary functions

[codecov[bot]]

Codecov Report

Attention: 401 lines in your changes are missing coverage. Please review.

Comparison is base (90e7604) 88.73% compared to head (57ae231) 88.30%. Report is 134 commits behind head on master.

Files	Patch %	Lines
...rch_geometric/explain/algorithm/subgraphX_utils.py	12.94%	195 Missing :warning:
...geometric/explain/algorithm/subgraphX_explainer.py	19.53%	103 Missing :warning:
...orch_geometric/explain/algorithm/subgraphX_mcts.py	19.53%	103 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8598      +/-   ##
==========================================
- Coverage   88.73%   88.30%   -0.44%     
==========================================
  Files         479      482       +3     
  Lines       29847    31646    +1799     
==========================================
+ Hits        26486    27944    +1458     
- Misses       3361     3702     +341     

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