pyg-lib neighbor sampler integration

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #5388 (b01f020) into master (40ad1af) will decrease coverage by 0.03%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master    #5388      +/-   ##
==========================================
- Coverage   83.38%   83.35%   -0.04%     
==========================================
  Files         342      342              
  Lines       18745    18771      +26     
==========================================
+ Hits        15630    15646      +16     
- Misses       3115     3125      +10     

Impacted Files	Coverage Δ
torch_geometric/sampler/neighbor_sampler.py	90.90% <70.58%> (-9.10%)	⬇️
torch_geometric/loader/neighbor_loader.py	90.80% <100.00%> (ø)
torch_geometric/sampler/base.py	96.29% <100.00%> (+0.29%)	⬆️

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