[Feat]: On App Editor page, for a Navigation, Make Menu items/subitems collapsable/uncollapsable in Properties window

[adnanqaops]

Is your feature request related to a problem? Please describe.
For PC/Mobile Navigation, if there are too much items/sub items on the Navigation, then it becomes hard to locate and navigate to an item/sub-item of the Navigation. So, allowing User to Collapse/Uncollapse an Item or Sub-item will fix this UX issue.

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