feat: add support for custom column and cells in table

[Jesperpaulsen]

This PR introduces custom columns/cells.

With this PR it's possible to define custom columns. It's also possible to add a custom component for the cell. If no component has been provided, it will fall back to the standard component for that field type.

The structure for a field have been updated to:

const customColumns = [
  {
    title: 'Title 2',
    name: 'title2',
    type: 'string',
    query: "title"
  },
  {
    title: 'Cast Members',
    name: 'castMembers',
    type: 'number',
    query: "count(castMembers)",
    component: ({ castMembers }) => <div style={{ color: 'green' }}>{castMembers}</div>
  }
]

export default () =>
  S.list()
    .title('Base')
    .items([
      S.listItem().title('Normal List').child(createSuperPane('movie', S, customColumns)),
    ]);

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[Jesperpaulsen]

Closing this for now. I'm now longer maintaining the repo the PR was opened from, and the changes this PR introduces is probably to big to be implemented now.