PyTorch Sparse Tensor support: HANConv, GATv2Conv, HGTConv, GMMConv, GPSConv, and RGATConv

[EdisonLeeeee]

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[codecov]

Codecov Report

Merging #6932 (63c96f7) into master (3e9ec36) will decrease coverage by 0.21%.
The diff coverage is 71.42%.

❗ Current head 63c96f7 differs from pull request most recent head 8debcfd. Consider uploading reports for the commit 8debcfd to get more accurate results

@@            Coverage Diff             @@
##           master    #6932      +/-   ##
==========================================
- Coverage   91.63%   91.43%   -0.21%     
==========================================
  Files         430      430              
  Lines       23420    23424       +4     
==========================================
- Hits        21462    21417      -45     
- Misses       1958     2007      +49     

Impacted Files	Coverage Δ
torch_geometric/nn/conv/rgat_conv.py	82.47% <33.33%> (-1.74%)	⬇️
torch_geometric/nn/conv/gatv2_conv.py	94.69% <100.00%> (+0.14%)	⬆️
torch_geometric/nn/conv/gps_conv.py	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes

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