[INLONG-5311][DataProxy] Support to configurated event handler to package event group and transform event content

[luchunliang]

Prepare a Pull Request

• Title : [INLONG-5311][DataProxy] Support to configurated event handler to package event group and transform event content
• Fixes #5311

Motivation

Explain here the context, and why you're making that change. What is the problem you're trying to solve?

Modifications

Describe the modifications you've done.

Verifying this change

(Please pick either of the following options)

• [ ] This change is a trivial rework/code cleanup without any test coverage.

• [ ] This change is already covered by existing tests, such as: (please describe tests)

• [ ] This change added tests and can be verified as follows:

  (example:)

  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a follow-up issue for adding the documentation

[github-actions[bot]]

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

[luchunliang]

This PR support this feature. https://github.com/apache/inlong/pull/6219