Keyboard navigation in the results view

[dashersw]

1. Up / down arrows should move between rows
2. left / right arrows should expand / collapse documents / arrays
3. cmd+alt+0 should collapse all documents
4. cmd+alt+1 should expand all documents by one level
5. cmd+alt+2 should expand all documents by two levels
6. cmd+alt+3 should expand all documents by three levels
7. cmd+alt+9 should expand all documents infinitely
8. shift + up / down arrows should select multiple rows / documents
   1. expansion / copy shortcuts should expand all selected documents