Refactor: extract repeated values into named constants

[D-sense]

This PR does the following refactoring:

1. Extract repeated values into named constants.
2. Fix TraceMergedToolCalls() comment.

[gemini-code-assist[bot]]

Summary of Changes

Hello @D-sense, 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 primarily focuses on enhancing the maintainability and clarity of the telemetry module by refactoring repeated string literals into named constants. This change centralizes frequently used values, making the code easier to understand and less prone to inconsistencies. Additionally, a minor correction was made to a function comment. The inclusion of .idea files addresses local IDE configuration, which is separate from the core refactoring effort.

Highlights

• Code Refactoring: Extracted numerous repeated string literals used as telemetry attribute keys and values into named constants within internal/telemetry/telemetry.go. This improves code readability and maintainability by centralizing these values.
• Telemetry Function Updates: Replaced hardcoded string values with the newly defined constants across the TraceMergedToolCalls, TraceToolCall, and TraceLLMCall functions, ensuring consistency and reducing potential for errors.
• Comment Correction: Corrected a comment for the TraceMergedToolCalls function to accurately reflect its purpose.
• IDE Configuration Files: Added several .idea configuration files (.gitignore, adk-go.iml, modules.xml, vcs.xml) which are typically used for local IntelliJ IDEA project setup.

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[D-sense]

Code Review

This pull request effectively refactors repeated string values into named constants, improving code clarity. The fix to the TraceMergedToolCalls comment is also a good catch. I've identified a recurring bug in TraceMergedToolCalls and TraceToolCall where a telemetry attribute key is duplicated, and I've left specific comments with suggestions. Also, it appears that IDE-specific files from the .idea directory have been included. These should typically be excluded from version control by adding .idea/ to the project's root .gitignore file and removing them from this PR.

The .idea directory has been untracked and excluded.

[D-sense]

This is ready for review when someone gets a chance!