asf.yaml: add active contributors as collaborators

[tuhaihe]

In this commit, we added the following active contributors as collaborators for this project:

• Mulily0513
• MisterRaindrop
• ostinru

fix #ISSUE_Number

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• Make sure that your Pull Request has a clear title and commit message. You can take the Git commit template as a reference.
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• Learn the code contribution and doc contribution guides for better collaboration.
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• Feel free to ask for the cloudberrydb team to help review and approve.

[tuhaihe]

Hey guys, will add you as the collaborators for this repo. You are allowed assign, edit, and close issues and pull requests. That would be much more convenient for your contributions.

cc @Mulily0513 @MisterRaindrop @ostinru

[my-ship-it]

LGTM，thank you all for the good work.