[Feature][Agent] Support filter function

[wangpeix]

Description

When some data is not needed, there is no need to send to downstream. So, the Agent may need to support discarding some unwanted data.

Use case

No response

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

[github-actions[bot]]

This issue is stale because it has been open for 60 days with no activity.

[justinwwhuang]

This will be provided later through Tranformer, and there is no need to provide a separate filtering function

[github-actions[bot]]

This issue is stale because it has been open for 60 days with no activity.

[aloyszhang]

This issue has been open for a long time with no activity, close it first and feel free to re-open it if needed.