[INLONG-8447][Manager] Optimize paging logic

[vernedeng]

Prepare a Pull Request

(Change the title refer to the following example)

• Fixes [Improve][Manager] Optimize paging logic #8447

Motivation

To optimize the paging logic.

Modifications

Implements foreach() and map() for the paging data.

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

[healchow]

@vernedeng Good job. Please add more detail in the PR's description box, thanks.