Make torch-sparse dependency optional (part 4)

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6628 (bbeec0f) into master (ef2d7be) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #6628      +/-   ##
==========================================
- Coverage   87.55%   87.55%   -0.01%     
==========================================
  Files         422      422              
  Lines       22883    22881       -2     
==========================================
- Hits        20036    20034       -2     
  Misses       2847     2847              

Impacted Files	Coverage Δ
torch_geometric/sampler/neighbor_sampler.py	91.56% <0.00%> (ø)
torch_geometric/loader/shadow.py	95.83% <100.00%> (-0.09%)	⬇️
torch_geometric/sampler/hgt_sampler.py	100.00% <100.00%> (ø)

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