chore: adding codeowners

[ChiefHolland]

*Thank you for submitting a contribution to the zeek-kafka writer plugin.

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Summary of the contribution

This PR adds codeowners to maintain vuln management efforts without hitting SPF.
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Testing

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Checklist

• Confirm that any associated issues are indicated in the pull request title
• Rebase your PR against the latest commit within the target branch
• Include steps to verify and test the intended change
• Write or update unit tests and/or integration tests to verify your changes
• Run shellcheck against any new or updated shell scripts, indicating the reasoning behind any disabled checks
• Indicate whether or not this is a breaking change
• Ensure that any new dependencies are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0