Fix Azure embeddings model detection by passing string to fullURL

[greysteil]

A recent pull request broke support for the Azure OpenAI embeddings endpoint by passing a variable of type EmbeddingModel to client.fullURL. This breaks the Azure deployment name lookup.

This pull request fixes Azure embeddings support by casting the type to string.

Tests
Added tests for generating Azure embeddings

Note: I'm not a great Go programmer. If there's a better way to do this I'm all ears!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (09f6920) 98.43% compared to head (c72f9ec) 98.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #637   +/-   ##
=======================================
  Coverage   98.43%   98.43%           
=======================================
  Files          24       24           
  Lines        1342     1342           
=======================================
  Hits         1321     1321           
  Misses         15       15           
  Partials        6        6           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sashabaranov]

@greysteil great catch, thank you!

For context: here's the exact part which breaks https://github.com/sashabaranov/go-openai/blob/master/client.go#L224

And a minimal code example to reproduce: https://go.dev/play/p/KakKIBplunp

There's an open issue to get rid of args ...any there and make this part type-safe #636