Add a way to change the chevron color in the Breadcrumbs component

[tnrich]

Feature request

Depending on the background color that the Breadcrumbs component is being rendered on top of, the default Breadcrumb color might not look all that great:

Examples

Unfortunately it seems like the breadcrumb chevron color has been hardcoded into the component:

It would be awesome if we could modify this color via CSS but it doesn't seem possible AFAICT.

Any advice for doing so or any changes to allow that would be awesome. Thanks!