feat: add AgentCard to interceptors parameters

[guglielmo-san]

Description

This PR add a feature to PR #223 adding the agentCard to the interceptors' parameters. Some values of the agentCard may be necessary at the interceptors level (e.g. security schemes).

BEGIN_COMMIT_OVERRIDE
refactor: add AgentCard to interceptors parameters
END_COMMIT_OVERRIDE

[gemini-code-assist]

Summary of Changes

Hello @guglielmo-san, 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 refactors the client-side interceptor mechanism to expose the AgentCard data directly to interceptors. By making the AgentCard available in both pre- and post-execution arguments, interceptors can now utilize agent-specific details, like security configurations, to perform more context-aware operations or validations, thereby improving the flexibility and power of the interception pipeline.

Highlights

• Interceptor Parameters: The AgentCard object is now included as a parameter in both BeforeArgs and AfterArgs interfaces for client-side interceptors.
• Enhanced Interceptor Logic: This change allows interceptors to access agent-specific information, such as security schemes from the AgentCard, enabling more sophisticated logic within the interceptor chain.
• Integration with Existing Feature: This pull request builds upon and enhances the functionality introduced in PR feat: implement client interceptors #223.

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[gemini-code-assist]

Code Review

This pull request aims to add the agentCard to interceptor parameters. The implementation correctly updates the necessary interfaces and the generic executeWithInterceptors method. However, the changes are incomplete as the streaming methods (sendMessageStream and resubscribeTask) have not been updated to pass the agentCard. Additionally, tests have not been updated to validate the new functionality. I've added specific comments with suggestions to address these issues.