chore(go): improved the Genkit Go package docs

[apascal07]

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[gemini-code-assist]

Summary of Changes

Hello @apascal07, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request substantially improves the documentation for the Genkit Go package. It introduces new example test files to illustrate the usage of various AI and core functionalities, making it easier for developers to understand and implement Genkit features. Additionally, comprehensive package-level documentation files (doc.go) have been added for key modules, providing detailed explanations of Genkit's foundational action system, logging, tracing, and overall framework. Existing documentation comments within genkit.go have also been refined to improve clarity, detail available options, and guide users on when to use registered vs. unregistered components.

Highlights

• New Example Files: Added new example_test.go files for the ai, core, and genkit packages, providing practical usage examples for various functions and types within the Genkit Go framework.
• Comprehensive Package Documentation: Introduced new doc.go files for the core, core/logger, core/tracing, and genkit packages, offering detailed, package-level overviews of their functionalities, concepts, and usage patterns.
• Enhanced API Documentation: Significantly updated documentation comments within go/genkit/genkit.go for key functions like DefineModel, DefineTool, DefinePrompt, and various Generate methods. These updates include clearer explanations, detailed # Options sections, and guidance on when to use registered vs. unregistered components.

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[gemini-code-assist]

Code Review

This pull request significantly improves the documentation for the Genkit Go package. It adds comprehensive package-level documentation (doc.go) and example tests (example_test.go) for the core, ai, logger, tracing, and genkit packages. The function-level comments in genkit.go have also been greatly expanded and clarified. These changes make the library much easier to understand and use for both application and plugin developers. The code examples are clear and follow Go conventions. Overall, this is an excellent contribution to the project's documentation. I have one minor suggestion to improve consistency in the core/tracing documentation.