Keyboard support: add keyboard support to rowSelector component.

When a dataTable with a rowSelector has focus, the following keys will function:


Default (multiple=false, enhancedMultiple=false):

Down/Up arrows - Will move the selected row to the next/prev row in the table (changes row selection status).


Multiple=true:

- Down/Up arrows - Will move the row selector highlight bar to the next/prev row in the table, similar to hovering over the row with the mouse currently (does not change row selection status).
- Spacebar - toggle the selected state of the currently highlighted dataTable row, DOES NOT deselect any previously selected rows.

enhancedMultiple=true:

- Down/Up arrows - Will move the row selector highlight bar to the next/prev row in the table, similar to hovering over the row with the mouse currently (does not change row selection status).
- Spacebar - toggle the selected state of the currently highlighted row, deselects any previously selected rows.
- Ctrl+Spacebar - toggle the selected state of the currently highlighted row, DOES NOT deselect any previously selected rows.
- Shift+Spacebar - Selects a contiguous range of all rows from last selected row to the currently highlighted row, deselects any previously selected rows outside of this range.
- Ctrl+Shift+Spacebar - Selects a contiguous range of all rows from last selected row to the currently highlighted row, DOES NOT deselect any previously selected rows.

In all cases, setting "keyboardNavigationEnabled=false" will disable the keyboard navigation on the component.