[Feature][Agent] Support CloudEvents Source

[dockerzhang]

Description

CloudEvents is a specification for describing event data in common formats to provide interoperability across services, platforms and systems.

https://github.com/cloudevents/spec

Use case

Kafka Example: https://github.com/cloudevents/sdk-java/tree/master/examples/kafka

Are you willing to submit PR?

• [ ] Yes, I am willing to submit a PR!

Code of Conduct

• [X] I agree to follow this project's Code of Conduct