Add batch api example

[eiixy]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.92%. Comparing base (774fc9d) to head (ea1609c).
Report is 77 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #808      +/-   ##
==========================================
+ Coverage   98.46%   98.92%   +0.45%     
==========================================
  Files          24       26       +2     
  Lines        1364     1389      +25     
==========================================
+ Hits         1343     1374      +31     
+ Misses         15        9       -6     
  Partials        6        6              

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[sashabaranov]

Thank you for the PR! Could you please make it an integration test as well? The library would really benefit from more integration tests (see #771)

For more details: https://github.com/sashabaranov/go-openai/blob/master/api_integration_test.go

[eiixy]

I noticed that when people use the CreateBatchWithUploadFile method, they often overlook the AddChatCompletion, AddCompletion, and AddEmbedding helper methods in the CreateBatchWithUploadFileRequest. Therefore, I added the CreateBatchWithChatCompletions and CreateBatchWithEmbeddings methods to clarify their usage.