Pytorch Sparse tensor support: GATConv, GatedGraphConv, GCN2Conv, and GENConv

[EdisonLeeeee]

No description provided.

[codecov]

Codecov Report

Merging #6897 (27828f8) into master (688c754) will decrease coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6897      +/-   ##
==========================================
- Coverage   91.80%   91.50%   -0.30%     
==========================================
  Files         428      428              
  Lines       23254    23235      -19     
==========================================
- Hits        21348    21261      -87     
- Misses       1906     1974      +68     

Impacted Files	Coverage Δ
torch_geometric/nn/conv/fa_conv.py	95.00% <ø> (ø)
...ch_geometric/explain/algorithm/captum_explainer.py	98.73% <100.00%> (-1.27%)	⬇️
torch_geometric/nn/conv/gat_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/gen_conv.py	95.28% <100.00%> (+0.23%)	⬆️
torch_geometric/utils/loop.py	100.00% <100.00%> (ø)

... and 37 files with indirect coverage changes

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[rusty1s]

@EdisonLeeeee Can we add a test for the add_self_loops change?

[EdisonLeeeee]

Sorry for not being able to respond and address the comments promptly. Thank you @rusty1s for making it merged.

[rusty1s]

No worries, it was a fun exercise :)