Implement showing global crumb actions

[raimund-schluessler]

In order to show an Actions or Buttoncomponent (or actually anything else you put into the slot) directly adjacent to the right of the last crumb, the element needs to be a child of the breadcrumbs container. So I added a slot and take the elements width into account when hiding the overflowing crumbs.

This is how it looks now with a button:

And an Actions component:

This is the last step (maybe 🙂) in order to make it look like @nimishavijay mockup:

[nimishavijay]

🚀

[jancborchardt]

Awesome work @raimund-schluessler! :)