…77f1 (#1405)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

- convert component to use `script setup` syntax to prepare for generics
  support
- prop definition can't use local vars w/ `script setup`, set defaults to undefined & use
  `defu` to merge defaults where applicable
- props mapped as local vars should overwrite direct prop references in
  the template
- modify `loadingState` & `emptyState` computed properties, if the
  corresponding props are explicitly set as `null` they will pass `null`
  to maintain existing functionality
- cast `rows` prop to a new generic type that extends a basic object
  representation
- TODO: consider using `keyof Row` type on column keys to enforce type
  on internal functionality (need to solve for custom `action`-like columns)