[WEB-1004] feat: Pragmatic dnd implementation for Kanban

[rahulramesha]

WEB-1004

This PR is aimed at replacing the @hello-pangea/dnd with the new @atlaskit/pragmatic-drag-and-drop.
As part of the effort, in this PR we have replaced the library in the Kanban with Pragmtic-drag-and-drop.

• This Enables better performance in drag and drop for Kanban blocks.
• This Library also gives power to enable autoscroll while dragging even with having different scroll containers
• Because of the above capability, we were also able to make individual column scrollable as well

Before:

Before.Pragmatic.dnd.mov

After:

With.Pragmatic.DND.mov