allow pkg/v1/random to accept a RNG source

[ktarplee]

Closes #1674

[codecov-commenter]

Codecov Report

Merging #1675 (02c33d9) into main (58bd35b) will increase coverage by 0.96%.
The diff coverage is 97.36%.

@@            Coverage Diff             @@
##             main    #1675      +/-   ##
==========================================
+ Coverage   71.89%   72.85%   +0.96%     
==========================================
  Files         120      121       +1     
  Lines        9833     9630     -203     
==========================================
- Hits         7069     7016      -53     
+ Misses       2046     1937     -109     
+ Partials      718      677      -41     

Impacted Files	Coverage Δ
pkg/v1/random/image.go	79.66% <87.50%> (+1.08%)	⬆️
pkg/v1/random/index.go	74.13% <100.00%> (ø)
pkg/v1/random/options.go	100.00% <100.00%> (ø)

... and 17 files with indirect coverage changes