Refactor GENConv to rely on new Aggregation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4866 (2b6357d) into master (fb34a77) will increase coverage by 0.02%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master    #4866      +/-   ##
==========================================
+ Coverage   82.75%   82.78%   +0.02%     
==========================================
  Files         329      329              
  Lines       17703    17678      -25     
==========================================
- Hits        14651    14634      -17     
+ Misses       3052     3044       -8     

Impacted Files	Coverage Δ
torch_geometric/nn/conv/gen_conv.py	85.91% <90.00%> (+2.75%)	⬆️
torch_geometric/nn/conv/sage_conv.py	96.42% <100.00%> (+1.69%)	⬆️
torch_geometric/nn/aggr/base.py	93.87% <0.00%> (+2.04%)	⬆️

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