Drop torch_sparse dependency in data.* and loader.*

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6139 (e9e5e29) into master (ce2a84f) will decrease coverage by 0.00%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master    #6139      +/-   ##
==========================================
- Coverage   84.36%   84.35%   -0.01%     
==========================================
  Files         363      363              
  Lines       20480    20483       +3     
==========================================
+ Hits        17277    17278       +1     
- Misses       3203     3205       +2     

Impacted Files	Coverage Δ
torch_geometric/data/data.py	92.21% <ø> (-0.02%)	⬇️
torch_geometric/data/hetero_data.py	95.07% <ø> (-0.02%)	⬇️
torch_geometric/loader/utils.py	84.18% <ø> (-0.09%)	⬇️
torch_geometric/data/storage.py	79.44% <77.77%> (-0.62%)	⬇️
torch_geometric/data/collate.py	91.78% <100.00%> (+0.05%)	⬆️
torch_geometric/data/graph_store.py	92.89% <100.00%> (+0.04%)	⬆️
torch_geometric/data/separate.py	100.00% <100.00%> (ø)
torch_geometric/loader/cluster.py	95.06% <100.00%> (+0.06%)	⬆️
torch_geometric/loader/graph_saint.py	98.01% <100.00%> (ø)
torch_geometric/loader/neighbor_sampler.py	77.21% <100.00%> (ø)
... and 2 more

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