UI5 web component based breadcrumbs plugin

[hardl]

With https://github.com/SAP/luigi/issues/1815 luigi introduces a breadcrumbs rendering interface, allowing a luigi core app developer to use his custom breadcrumbs view implementation. For convenience reasons, luigi should provide a OOB solution using ui5 web components, which can be used as a plugin, so a dedicated npm package.

See https://sap.github.io/ui5-webcomponents/playground/components/Breadcrumbs/