gh-134004: Added the reorganize() methods to dbm.sqlite, dbm.dumb and shelve (GH-134028)

They are similar to the same named method in dbm.gnu.

Lib/shelve.py

@@ -171,6 +171,11 @@ class Shelf(collections.abc.MutableMapping):
         if hasattr(self.dict, 'sync'):
             self.dict.sync()
 
+    def reorganize(self):
+        self.sync()
+        if hasattr(self.dict, 'reorganize'):
+            self.dict.reorganize()
+
 
 class BsdDbShelf(Shelf):
     """Shelf implementation using the "BSD" db interface.