feat: Added dispatcher class

Signed-off-by: divyagar <[email protected]>

casbin/persist/dispatcher.py

@@ -0,0 +1,21 @@
+class Dispatcher:
+    """Dispatcher is the interface for pycasbin dispatcher"""
+    def add_policies(self, sec, ptype, rules):
+        """add_policies adds policies rule to all instance."""
+        pass
+
+    def remove_policies(self, sec, ptype, rules):
+        """remove_policies removes policies rule from all instance."""
+        pass
+
+    def remove_filtered_policy(self, sec, ptype, field_index, field_values):
+        """remove_filtered_policy removes policy rules that match the filter from all instance."""
+        pass
+
+    def clear_policy(self):
+        """clear_policy clears all current policy in all instances."""
+        pass
+
+    def update_policy(self, sec, ptype, old_rule, new_rule):
+        """update_policy updates policy rule from all instance."""
+        pass