[Table] Resolve differences between <EditableCell> and <EditableName>

[cmslewis]

Bug report

• Package version(s): v1.20.0

Changes proposed

There are some differences between EditableCell and EditableName that we should resolve:

• Should emit the columnIndex as a second parameter in onCancel, onChange, and onConfirm callbacks
• Should fully control the value so that updating props.name actually renders the new name. (See: [Table] Editable ColumnHeaderCell shows old value after reordering columns #1257, [Table] EditableCell + setState = value doesn't change #1234)

[gscshoyru]

Note: so far as I can tell, doing the first part here is going to require cloning the results of renderName the same way we do for table cells, so it knows what index it is. Is this alright? I'm somewhat loathe to do more cloning, 'cause I know it tends to impact perf.