examples: vue sorting controlled

[radusuciu]

This is based on the vue controlled pagination example which might have some issues as noted in #4956.

One thing was unclear to me. When setting the state property that is passed to the useVueTable composable, here is what I'm doing in this example:

  state: {
    pagination: pagination.value,
    get sorting() {
      return sorting.value
    },
  },

this did not work:

  state: {
    pagination: pagination.value,
    sorting: sorting.value
  },

and I'm not entirely sure why. Though based on other issues/discussions/comments from vue users of this library, I think I'm not alone in being a little confused about the use of getters in dealing with table state and data.