Add support for Structured Outputs

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.23%. Comparing base (988211b) to head (2ca0910).

Files	Patch %	Lines
...hub/sashirestela/openai/common/ResponseFormat.java	90.00%	0 Missing and 1 partial :warning:
...restela/openai/support/DefaultSchemaConverter.java	91.66%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #175 +/- ## ============================================ - Coverage 95.26% 95.23% -0.04% - Complexity 137 142 +5 ============================================ Files 52 52 Lines 612 629 +17 Branches 27 30 +3 ============================================ + Hits 583 599 +16 Misses 17 17 - Partials 12 13 +1 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud