added KGTOSA BRW sampler and KGBen banchmark dataset loader

[hussien]

KGBen banchmark dataset loader
KGTOSA BRW sampler

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 89.55%. Comparing base (beb9f7d) to head (dbfc40a).
Report is 36 commits behind head on master.

Files	Patch %	Lines
torch_geometric/loader/BRW.py	47.82%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9136      +/-   ##
==========================================
- Coverage   90.02%   89.55%   -0.48%     
==========================================
  Files         470      471       +1     
  Lines       30164    30188      +24     
==========================================
- Hits        27156    27034     -122     
- Misses       3008     3154     +146     

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