Add testable json marshaller

[sashabaranov]

No description provided.

[codecov]

Codecov Report

Merging #161 (c4e3a73) into master (ba77a64) will increase coverage by 5.87%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
+ Coverage   50.36%   56.23%   +5.87%     
==========================================
  Files          16       17       +1     
  Lines         548      553       +5     
==========================================
+ Hits          276      311      +35     
+ Misses        211      189      -22     
+ Partials       61       53       -8     

Impacted Files	Coverage Δ
api.go	69.56% <71.42%> (+5.92%)	⬆️
chat.go	83.33% <100.00%> (+16.66%)	⬆️
completion.go	58.82% <100.00%> (+17.64%)	⬆️
edits.go	75.00% <100.00%> (+25.00%)	⬆️
embeddings.go	38.46% <100.00%> (+23.07%)	⬆️
fine_tunes.go	63.26% <100.00%> (+6.12%)	⬆️
image.go	51.72% <100.00%> (+3.44%)	⬆️
marshaller.go	100.00% <100.00%> (ø)
moderation.go	75.00% <100.00%> (+25.00%)	⬆️

... and 1 file with indirect coverage changes

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