Widget strucured classification (#174)
* Implement StrcturedDataClassificationWidget
* Refactor table widgets to support dark mode & strucutred data
* Add StrcuDataClassWidget to demo index.svelte
* Fix code style
* Misc changes (border, addCol optional, refactor, scrolltorigh)
* Chore revert tableContainerEl declaration
* Fix pasted value not getting detected
* Chrore error message
* Fix firefox css row line height issue
* Highlight/red missing value cell
* Lint
* Chore
* Fix indentation
* Convert `string[]` -> `(string | number)[]`
* Rise TypeError on invalid output
* Format
* Convert `string[]` -> `(string | number)[]`
