Support for async processor added.

[sunlei1024]

Summary:
This PR introduces support for asynchronous processors, enabling the system to handle async tasks more efficiently and integrate seamlessly with async workflows.

Changes include:

• Refactor processor logic to support async execution
• Update relevant functions to be awaitable
• Ensure backward compatibility with synchronous processors

Benefits:

• Allows users to run processors asynchronously
• Improves concurrency and performance for async tasks
• Lays groundwork for future async features

Testing:

• Existing synchronous processor tests remain passing

[paddle-bot]

Thanks for your contribution!