Add comments to OpenAiService.java

[RomanPilyushin]

Add Comments to OpenAiService.java Methods

Summary

This pull request adds detailed comments to the methods in the OpenAiService.java class. The purpose of these comments is to improve code readability and maintainability, making it easier for both current and future developers to understand the functionality of each method.

Changes

• Added descriptive comments to each method in OpenAiService.java.
• Comments include a brief overview of the method's purpose, parameters, and return type.
• Ensured consistency in comment style across the entire class.

Impact

• Readability: Enhances the readability of the code, making it easier to understand and modify.
• Documentation: Serves as an in-code documentation for anyone working on or reviewing the codebase.

Testing

• No changes in the code logic, so no additional tests are required.
• The existing unit tests are sufficient to ensure functionality.