Support data deletion in a Fragment

Problem Statement

Support deletion of rows on a Fragment level. This capability will be used as global Dataset-level deletion or distributed execution of delete operations.

We could expect a method with a signature:

impl Fragment {
   
   /// Returns a new Fragment representing the data being deleted. 
   ///
   /// If returns None, the full fragment is deleted.
   async fn delete(&self,  filter_expr: &str) -> Optional<Fragment> {
       ...
   }
}

Action items

• Decide the on-disk mechanism for tracking deletion lazily.
• #908
• #915
• #916
• #943
• #934
• #944
• #973
• #993

Start with the proposed Fragment::delete entry point and review the linked action items, especially the remaining #943 item, along with the completed issues listed in the description. Done means Fragment-level deletion supports the stated filter behavior and returns either a new Fragment or no Fragment when the full fragment is deleted.