openai: add make it possible to set the "user" in the gpt completion call

[brainexe]

call

[codecov-commenter]

Codecov Report

Merging #495 (2b8c0ec) into master (2e5c7ff) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head 2b8c0ec differs from pull request most recent head a63dbed. Consider uploading reports for the commit a63dbed to get more accurate results

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@@            Coverage Diff             @@
##           master     #495      +/-   ##
==========================================
- Coverage   82.65%   82.62%   -0.03%     
==========================================
  Files         134      134              
  Lines        6127     6128       +1     
==========================================
- Hits         5064     5063       -1     
- Misses        932      933       +1     
- Partials      131      132       +1     

Files	Coverage Δ
command/openai/client.go	77.94% <100.00%> (+0.32%)	⬆️
command/openai/config.go	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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