feat(spec): Add PauseTask and ResumeTask methods to A2A service.

[herczyn]

Fixes #1276.

[gemini-code-assist]

Summary of Changes

Hello @herczyn, 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 A2A gRPC service specification by introducing new functionalities to pause and resume tasks. It defines new RPC methods, corresponding request messages, and updates the TaskState enum and AgentCapabilities to support these operations, providing more granular control over task execution within the A2A system.

Highlights

• New Task Control Methods: Introduced PauseTask and ResumeTask RPC methods to the A2AService, allowing for the suspension and continuation of tasks. These methods include RESTful HTTP bindings for flexible API access.
• Task State Update: Added TASK_STATE_PAUSED to the TaskState enum to represent tasks that are in a paused state. Note: This new enum value 8 duplicates an existing value (TASK_STATE_AUTH_REQUIRED), which is an error in Protocol Buffers and should be corrected.
• Agent Capability Declaration: A new pause_resume boolean field was added to AgentCapabilities to indicate whether an agent supports the ability to pause and resume tasks.
• New Request Messages: Defined PauseTaskRequest and ResumeTaskRequest messages, which specify the necessary parameters (tenant and task name) for initiating pause and resume operations.

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[gemini-code-assist]

Code Review

This pull request introduces PauseTask and ResumeTask methods to the A2A service, along with the necessary supporting changes in the protobuf specification. The implementation is mostly correct, but there is a critical issue with a duplicate enum value in TaskState that must be addressed. Additionally, there are some minor copy-paste errors in the comments for the new request messages that should be corrected for clarity.