Is your feature request related to a problem? Please describe...

I'm using <b-nav-item> as a router link and I need to use exact-path prop for <router-link> introduced in Vue Router 3.5.0: https://router.vuejs.org/api/#exact-path

Describe the solution you'd like

Create exact-path property for <b-nav-item> and pass it down to <router-link>