Add LinkPredPersonalization metric

[rusty1s]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.33%. Comparing base (bb6601c) to head (ee69360).
Report is 95 commits behind head on master.

Files with missing lines	Patch %	Lines
torch_geometric/metrics/link_pred.py	89.74%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10015      +/-   ##
==========================================
- Coverage   87.04%   86.33%   -0.72%     
==========================================
  Files         490      490              
  Lines       32492    32532      +40     
==========================================
- Hits        28282    28085     -197     
- Misses       4210     4447     +237     

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