[FEAT] Multi level menu - option to show expanded menu by default

[sstopkin]

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

The issue is that currently, resources with parent cannot be shown expanded in the menu. Only collapsed by default.

Describe alternatives you've considered

N/A

Additional context

Describe the thing to improve

Add an option to RefineProps (like showCollapsed=ture|false) to be able to change default behaviour of this. Thank you.