Add random function

[agonist]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (79af2d0) 78.89% compared to head (c8bf023) 78.84%.

Files	Patch %	Lines
internal/expr/functions/math.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #514      +/-   ##
==========================================
- Coverage   78.89%   78.84%   -0.05%     
==========================================
  Files         126      126              
  Lines       10905    10909       +4     
==========================================
- Hits         8603     8601       -2     
- Misses       1578     1584       +6     
  Partials      724      724              

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