feat(SidebarNav): navLink `attributes` - optional JS object with valid JS API naming
feat(SidebarNav): navLink `attributes` - optional JS object with valid JS API naming

- starting with `@coreui/coreui`, `@coreui/react` `v2.1.0` and up
- valid attributes: `rel`, `target`, `hidden`, `disabled`, etc...

mrholek/CoreUI-React,mrholek/CoreUI-React