Move rows or columns with keyboard shortcuts in Numbers
AFAIK you can't.

The closest you can get is highlighting a row/column/cell, and long-pressing (or force touching) then dragging, to insert/replace somewhere else. Also, highlight one of the above and pressing Option-ArrowKey (substitute ArrowKey for an arrow key) to insert a row/column/cell in the direction of the arrow key.

Here is a link to the Numbers Keyboard Shortcuts help.