* Introduce FilterArgs as a seam
* Selecting a value adds to Script and Preview
* Hydrate FilterArgs dropdown from function body
* Functional operator selector
* Style polish
* Rename Filter/FilterPreview components
* Pull types into flux type file
* Derive Flux Filter UI state directly from AST
* Default func body
* Remove flicker when updating conditions
* Render a div when filter body isn't supported
* Base condition (true) is parseable
* Remove a test file if it doesn't have any tests
* Enable tslint and resolve errors
* Address other PR feedback
* Tests and improved parsing logic
* Add helper text when filter ui falls back to a textarea
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