refactor: remove the type Message from the possible return type of resubscribe API

[guglielmo-san]

Description

ResubscribeTask should not support the type Message as a Response.

[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 resubscribeTask API by narrowing its possible return types. It introduces a new type definition that explicitly excludes Message from the stream of events returned by this method, ensuring that consumers of resubscribeTask receive only relevant task-related events and not general messages. This change improves type safety and clarifies the API's contract.

Highlights

• Type Definition Refinement: A new type A2AStreamEventDataResubscribe has been introduced, which explicitly excludes the Message type from the A2AStreamEventData union, ensuring more precise type definitions for task-related streams.
• API Signature Update: The resubscribeTask method's return type has been updated across various client components (A2AClient, Client, JsonRpcTransport, Transport interface) to consistently use the more specific A2AStreamEventDataResubscribe type.
• Test Alignment: Corresponding unit tests have been updated to reflect the refined return type of the resubscribeTask method, ensuring type consistency throughout the codebase.

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[gemini-code-assist]

Code Review

This pull request refactors the resubscribeTask API to remove the Message type from its possible return values. The changes are applied consistently across the client, transport layers, and tests. However, there is a critical issue in the type definition for the new return type, which will prevent the code from compiling. I've left a comment with a suggested fix.