editor: Add support for drag_and_drop_selection (#30671)

Closes #4958 

Release Notes:

- Added support for drag and drop text selection. It can be disabled by
setting `drag_and_drop_selection` to `false`.

---------

Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

crates/vim/src/vim.rs

@@ -915,6 +915,9 @@ impl Vim {
         if mode == Mode::Normal || mode != last_mode {
             self.current_tx.take();
             self.current_anchor.take();
+            self.update_editor(window, cx, |_, editor, window, cx| {
+                editor.drop_selection(None, false, window, cx);
+            });
         }
         Vim::take_forced_motion(cx);
         if mode != Mode::Insert && mode != Mode::Replace {