fix-bug #559 unpredictable state of tableAction.reorder's function

[gibsonliketheguitar]

#559

• Use .reduce() to carry out data swap, and
• transform columns into a correct data structure for dispatch.

Details about Data swap

• During interaction,
  if curr.key === a.key, then copy data[b], index
  vice versa === b.key, acc[a.key] = { ...data[a], index }

I do request some clarification on the array mover function.

• When is there an undefined element?

I don't fully understand the arrayMover function.
I think I am missing an edge case, assistance would be awesome.

[notsidney]

For reorder, we want to move a column to a new position and push all columns right to make space, not swap the two columns’ positions.

[gibsonliketheguitar]

Will do

[gibsonliketheguitar]