Add actions to rename and delete schema objects

[Raubzeug]

We may add grouped items like:

Or make two separate buttons like:

[antonkovalenko]

@adameat please check if it's possible to delete / rename schema objects via a "handle"?

[adameat]

@adameat please check if it's possible to delete / rename schema objects via a "handle"?

unfortunately, there is only a handle to remove a directory

[antonkovalenko]

It's an epic that must contain tickets for every scheme object type:

• as a first step: make sure that every object has drop command snippet
• make sure that dir delete dialog exists
• support rename command (via dialog)
• support delete command (via dialog)
• ticket for backend - support rename and delete for every object type via universal handle (or not universal)