- Partially addresses #8228
- Moves several files into `@/util/vue` and `@/util/data`
- Makes imports more consistent:
- Remove redundant trailing `.ts`
- Convert *some* imports to use `@/` rather than `./`
- Ideally it should be all imports other than the ones outside of `src/`, but I can't be sure I've found all of them
- Merge *some* duplicated imports (caused by one being an `import type`)
# Important Notes
None
- Closes#8386
- Attempts to execute `<expr>.default_visualization` to query the engine for the *correct* fallback type
- If that is not possible, falls back to checking `inputType` - first for an exact match, then falling back to `Any` (i.e. the text/JSON visualization)
- Does not decide fallback based on the shape of the returned JSON
# Important Notes
Contains pretty significant refactors of `VisualizationMetadata` to allow it to be unset.
