fix: Refactor RunAgentRequest field names to snake_case

[tpryan]

Updated the JSON tags in the RunAgentRequest struct to use snake_case for consistency with API conventions. Removed the AssertRunAgentRequestRequired method and related imports.

Fixes #255

[gemini-code-assist[bot]]

Summary of Changes

Hello @tpryan, I'm Gemini Code Assist[^1]! 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 focuses on enhancing API consistency by refactoring the JSON field names within the RunAgentRequest struct to adhere to snake_case conventions. Concurrently, it cleans up the codebase by removing an obsolete validation method and its related import, contributing to a more standardized and maintainable API definition.

Highlights

• JSON Tag Refactoring: The JSON tags within the RunAgentRequest struct have been updated to use snake_case for improved API consistency, aligning with common conventions.
• Code Cleanup: The AssertRunAgentRequestRequired method and its associated fmt import have been removed, streamlining the codebase by eliminating obsolete validation logic.

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[tpryan]

I removed AssertRunAgentRequestRequired because as far as I can tell it isn't called anywhere.

[kdroste-google]

I'm afraid it would break ADK WebUI which is calling api/run_sse with payload like:

{"appName":"weather_time_agent","userId":"user","sessionId":"................","newMessage":{"role":"user","parts":[{"text":"London"}]},"streaming":false,"stateDelta":null}

[tpryan]

Well then we need to decide which pattern to follow, and document because as it is, new devs can't use this feature.

[rakyll]

What is the ADK API standard style? We need to be 100% compatible with the implementation in ADK Python.

[dpasiukevich]

What is the ADK API standard style? We need to be 100% compatible with the implementation in ADK Python.

This one https://github.com/google/adk-go/issues/255#issuecomment-3516317834

[rakyll]

camelCase is the official ADK API style, see https://github.com/google/adk-go/issues/255#issuecomment-3529831091 for more details.