feat: support numeric labels in neighbor algorithms

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Patch coverage: 91.66% and project coverage change: +0.20% 🎉

Comparison is base (80542ed) 70.17% compared to head (f71d871) 70.37%.
Report is 1 commits behind head on master.

❗ Current head f71d871 differs from pull request most recent head fe924bb. Consider uploading reports for the commit fe924bb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #740      +/-   ##
==========================================
+ Coverage   70.17%   70.37%   +0.20%     
==========================================
  Files          66       66              
  Lines       12535    12434     -101     
==========================================
- Hits         8796     8750      -46     
+ Misses       2927     2894      -33     
+ Partials      812      790      -22     

Files Changed	Coverage Δ
base/hnsw/vector.go	85.41% <85.41%> (ø)
base/hnsw/bruteforce.go	100.00% <100.00%> (ø)
master/tasks.go	59.78% <100.00%> (-0.22%)	⬇️

... and 34 files with indirect coverage changes

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