Make torch-sparse dependency optional (part 5)

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6629 (4bf3807) into master (bb827d8) will decrease coverage by 0.01%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##           master    #6629      +/-   ##
==========================================
- Coverage   87.55%   87.55%   -0.01%     
==========================================
  Files         422      422              
  Lines       22881    22877       -4     
==========================================
- Hits        20034    20030       -4     
  Misses       2847     2847              

Impacted Files	Coverage Δ
torch_geometric/nn/conv/eg_conv.py	90.35% <60.00%> (-0.09%)	⬇️
torch_geometric/nn/conv/arma_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/cluster_gcn_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/gated_graph_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/lg_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/mf_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/pan_conv.py	98.24% <100.00%> (ø)
torch_geometric/nn/conv/pdn_conv.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/rgcn_conv.py	95.33% <100.00%> (-0.04%)	⬇️
torch_geometric/nn/conv/signed_conv.py	100.00% <100.00%> (ø)
... and 2 more

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