Refactor SAGEConv to use LSTMAggregation

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #4863 (69138de) into master (d700ddb) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4863      +/-   ##
==========================================
- Coverage   82.79%   82.76%   -0.03%     
==========================================
  Files         329      329              
  Lines       17718    17708      -10     
==========================================
- Hits        14669    14656      -13     
- Misses       3049     3052       +3     

Impacted Files	Coverage Δ
torch_geometric/nn/conv/sage_conv.py	94.73% <100.00%> (-5.27%)	⬇️

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