Implement a random selection primitive

[seunghwak]

Add a primitive to support randomly selecting (without biases) vertex neighbors.

Also, refactored primitive tests to avoid duplicating code for vertex/edge source/edge destination property value generation.

[seunghwak]

rerun tests

[codecov-commenter]

Codecov Report

Base: 60.04% // Head: 60.04% // No change to project coverage :thumbsup:

Coverage data is based on head (726ff2c) compared to base (3eb2b40). Patch has no changes to coverable lines.

:exclamation: Current head 726ff2c differs from pull request most recent head e8d3ce9. Consider uploading reports for the commit e8d3ce9 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-22.10    #2703   +/-   ##
=============================================
  Coverage         60.04%   60.04%           
=============================================
  Files               111      111           
  Lines              6184     6184           
=============================================
  Hits               3713     3713           
  Misses             2471     2471           

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[ChuckHastings]

@gpucibot merge