testutil: random function for builder registration needed for vapi

[ciaranmcveigh5]

• Add random function for incoming vapi PR

category: feature
ticket: #849

[codecov]

Codecov Report

Merging #870 (668d139) into main (827d675) will decrease coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
- Coverage   54.39%   54.06%   -0.33%     
==========================================
  Files         114      114              
  Lines       12211    12213       +2     
==========================================
- Hits         6642     6603      -39     
- Misses       4603     4646      +43     
+ Partials      966      964       -2     

Impacted Files	Coverage Δ
core/qbft/qbft.go	71.67% <0.00%> (-9.45%)	⬇️
p2p/discovery.go	47.88% <0.00%> (-1.39%)	⬇️
core/dutydb/memory.go	70.63% <0.00%> (-1.28%)	⬇️
p2p/p2p.go	24.27% <0.00%> (+0.97%)	⬆️
dkg/transport.go	66.66% <0.00%> (+12.96%)	⬆️

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[corverroos]

can omit zero values, since they are automatically populated.