fix: support CitationMetadata

[nahapetyan-serob]

Added converters for CitationMetadata in ./server/adka2a/metadata.go and verified in test case.

[gemini-code-assist]

Summary of Changes

Hello @nahapetyan-serob, 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 integrates support for CitationMetadata into the system's event processing. The primary goal is to ensure that citation information is correctly serialized and deserialized when events are transformed into and from A2A metadata. This enhancement allows for the consistent and accurate handling of citation data throughout the system, with corresponding test updates to confirm its functionality.

Highlights

• CitationMetadata Support: Introduced comprehensive support for CitationMetadata within the system, allowing for its proper handling and transmission.
• Conversion Logic Implementation: Added new conversion logic in server/adka2a/metadata.go to serialize CitationMetadata from session.Event to A2A metadata and deserialize it back, ensuring data integrity across conversions.
• Test Case Verification: Updated an existing test case in agent/remoteagent/a2a_agent_test.go to include CitationMetadata in LLMResponse objects, validating the new functionality.

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[gemini-code-assist]

Code Review

This pull request adds support for CitationMetadata by including converters in server/adka2a/metadata.go and updating the test cases in agent/remoteagent/a2a_agent_test.go. The changes are correct and follow the existing pattern for handling other metadata types. I've included a couple of suggestions to refactor the repetitive logic for handling metadata serialization and deserialization, which would improve code maintainability.