Add testable request builder

[sashabaranov]

No description provided.

[codecov]

Codecov Report

Merging #162 (be0685e) into master (53d195c) will increase coverage by 10.49%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #162       +/-   ##
===========================================
+ Coverage   56.23%   66.72%   +10.49%     
===========================================
  Files          17       18        +1     
  Lines         553      529       -24     
===========================================
+ Hits          311      353       +42     
+ Misses        189      136       -53     
+ Partials       53       40       -13     

Impacted Files	Coverage Δ
api.go	70.96% <100.00%> (+1.40%)	⬆️
chat.go	100.00% <100.00%> (+16.66%)	⬆️
completion.go	66.66% <100.00%> (+7.84%)	⬆️
edits.go	100.00% <100.00%> (+25.00%)	⬆️
embeddings.go	45.00% <100.00%> (+6.53%)	⬆️
engines.go	86.66% <100.00%> (+60.00%)	⬆️
files.go	50.61% <100.00%> (+19.75%)	⬆️
fine_tunes.go	100.00% <100.00%> (+36.73%)	⬆️
image.go	52.43% <100.00%> (+0.71%)	⬆️
moderation.go	100.00% <100.00%> (+25.00%)	⬆️
... and 1 more

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