Added variance-preserving Aggregation

[rf523281]

A novel aggregation function as described in GNN-VPA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.50%. Comparing base (b678124) to head (5db41e8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9075      +/-   ##
==========================================
- Coverage   89.98%   89.50%   -0.48%     
==========================================
  Files         469      470       +1     
  Lines       30135    30151      +16     
==========================================
- Hits        27117    26988     -129     
- Misses       3018     3163     +145     

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[rusty1s]

Thank you :)