Add maintainers for Oxia

[merlimat]

Checklist for maintainer updates

Note

Delete this template if you're not changing the CSV file

• You've provided a link to documentation where the project has approved the maintainer changes.
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
• You've sent an email with the list of email address(es) to cncf-maintainer-changes@cncf.io for invitations to Service Desk and mailing lists. You can just mark this complete if you are only removing people.
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.

[Copilot]

Pull request overview

This PR adds six maintainers for the Oxia project, which is a Sandbox-level CNCF project. The maintainers are all from StreamNative and are documented in the Oxia project's GitHub repository. The PR fulfills the checklist requirements outlined in the description, including providing documentation links and notifying the appropriate email addresses.

Changes:

• Added six maintainers for the Oxia project to the project-maintainers.csv file
• All maintainers are from StreamNative organization
• Includes reference to the official MAINTAINERS.md document in the Oxia GitHub repository

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