React-table: [v7] Reorder columns by dragging example

[gargroh]

To re-order columns by dragging i have created an example by using react-beautiful-dnd

Link - https://codesandbox.io/s/gargroh-v7-drag-column-beautiful-react-dnd-encww

@tannerlinsley wanted to check, whether this is good to go example for everyone who uses v7 and want this feature OR using any other DnD/sortable library would be more compatible with react-table in terms complexity(of implementation)/ customization/better UX or anything else better....which you have thought while writing v7.

[tannerlinsley]

This is a perfectly fine example! Please make a PR to add it to the examples directory and examples.md.

[HassanAbbas198]

@tannerlinsley hello, is it necessary to use 'useAbsoluteLayout'? I'm trying to implement it and it is breaking my styles