Add TorchScript support to DegreeScalerAggregation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4934 (1e5e69d) into master (1ad526c) will decrease coverage by 0.03%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master    #4934      +/-   ##
==========================================
- Coverage   82.72%   82.68%   -0.04%     
==========================================
  Files         330      330              
  Lines       17843    17844       +1     
==========================================
- Hits        14760    14755       -5     
- Misses       3083     3089       +6     

Impacted Files	Coverage Δ
torch_geometric/nn/aggr/scaler.py	97.50% <91.66%> (-2.50%)	⬇️
torch_geometric/nn/aggr/base.py	93.61% <100.00%> (-0.27%)	⬇️
torch_geometric/nn/aggr/basic.py	100.00% <100.00%> (ø)
torch_geometric/nn/conv/pna_conv.py	91.42% <100.00%> (-0.58%)	⬇️
torch_geometric/utils/degree.py	100.00% <100.00%> (ø)
torch_geometric/testing/decorators.py	96.66% <0.00%> (-3.34%)	⬇️
torch_geometric/loader/neighbor_loader.py	86.16% <0.00%> (-2.52%)	⬇️

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