feat: add list and delete task push notification config rpc method and custom rpc methods for extensions

[HasmH]

• client is missing standard rpc methods defined in a2a protocol:
• tasks/pushNotificationConfig/list
• tasks/pushNotificationConfig/delete
• additionally, exposing generic method to support custom rpc methods

Description

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Fixes #118 🦕

[gemini-code-assist]

Summary of Changes

Hello @HasmH, 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 enhances the client by introducing two new RPC methods for managing task push notification configurations. These additions, listTaskPushNotificationConfig and deleteTaskPushNotificationConfig, bring the client closer to full compliance with the a2a protocol specification, allowing users to programmatically list and remove push notification settings for their tasks.

Highlights

• New RPC Methods for Task Push Notification Configuration: Two new RPC methods, listTaskPushNotificationConfig and deleteTaskPushNotificationConfig, have been added to the A2AClient class. These methods facilitate listing and deleting push notification configurations for tasks, aligning the client with the a2a protocol specification.
• Introduction of New Type Imports: The necessary types, including ListTaskPushNotificationConfigParams, ListTaskPushNotificationConfigResponse, DeleteTaskPushNotificationConfigResponse, and DeleteTaskPushNotificationConfigParams, have been imported from ../types.js to support the new RPC methods.

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[gemini-code-assist]

Code Review

This pull request adds two new RPC methods, listTaskPushNotificationConfig and deleteTaskPushNotificationConfig, to the A2AClient. The implementation is straightforward and follows the existing patterns in the client. I've made one suggestion to improve the accuracy of a JSDoc comment for better maintainability.

A key concern is the lack of tests for the new functionality. While the PR description indicates that tests pass, no new tests for the added methods have been included. It's crucial to add unit tests for listTaskPushNotificationConfig and deleteTaskPushNotificationConfig to ensure they behave as expected and to prevent future regressions. Please add tests for these new methods.

[HasmH]

@swapydapy Just bumping this, could I get a review? In need of this.

[swapydapy]

Small comments regarding the tests. Once you fix them ,we can merge this. Thank you.

[HasmH]

thanks @swapydapy ive addressed your comments, let me know how it goes