[Feature Request] highlight selected cell in table

### Existing Component
Yes

### Component Name
el-table

### Description
I see **el-table** has event **cell-click** for clicked columns. I need to **highlight** the selected cell. Is that currently possible? Can not find anything related to this in the documentation. In jquery datatable we can select one or multiple cells https://datatables.net/extensions/select/examples/initialisation/cells.html