Added log policies, for log filtering.

[keithjjones]

🗣 Description

This will allow for fine grain log filtering.

https://docs.zeek.org/en/master/frameworks/logging.html#filtering-log-records

💭 Motivation and context

We have some unique filtering needs, and this slight tweak will allow anyone to filter if they want.

🧪 Testing

I didn't add testing as it's a standard Zeek feature for logs.

✅ Pre-approval checklist

• [X] This PR has an informative and human-readable title.
• [X] Changes are limited to a single goal - eschew scope creep!
• [ ] All future TODOs are captured in issues, which are referenced in code comments.
• [ ] All relevant type-of-change labels have been added.
• [ ] I have read the CONTRIBUTING document.
• [ ] These code changes follow cisagov code standards.
• [ ] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [ ] Tests have been added and/or modified to cover the changes in this PR.
• [ ] All new and existing tests pass.

✅ Pre-merge checklist

• [ ] Revert dependencies to default branches.
• [ ] Finalize version.

✅ Post-merge checklist

• [ ] Create a release.

[kkvarfordt]

@keithjjones - Sorry for the slow timeline for getting this merged. Thanks for the contribution and the insight on Zeek log filtering.