More filtering cleanup

[h-m-m]

Why

I wanted to try adding a filter now that we've refactored how filters work in #546

I also wanted to try @exbinary's suggestion about a refactor to how parameters are passed around. I feel like this refactor is not yet complete — for example we might want to look into some of the duplication that now exists — but I felt this is a good point to stop and ask for feedback before going further

What

How

Testing

Next Steps

Outstanding Questions, Concerns and Other Notes

Accessibility

Security

Meta

Pre-Merge Checklist

• [ ] Security & accessibility have been considered
• [ ] Tests have been added, or an explanation has been given why the features cannot be tested
• [ ] Documentation and comments have been added to the codebase where required
• [ ] Entry added to CHANGELOG.md if appropriate
• [ ] Outstanding questions and concerns have been resolved
• [ ] Any next steps have been turned into Issues or Discussions as appropriate

[solebared]

Looking great! Also curious your thoughts on my spike extracting serialization out of the filter, linked in this comment.