Provide more options for opening subsequent microfrontends

[hardl]

Currently luigi provides two options to open a second visible micro frontend from within another micro frontend:

• open as modal
• open in split view

There is demand for more options like

• open as tab (not browser tab but sth like a tab bar above the micro frontend container)
• open as "drawer" or slide-in (basically vertical split view, maybe with animation)
• open as non-blocking modal
• open as [CUSTOM], so implemented by core app developer