jw.pkg.cmds.distro.backend.Backend: Add property util

Add a property .util to the Backend class, instanciated on demand
from to the respective distribution directory's Util class.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/distro/backend/Backend.py

@@ -1,7 +1,12 @@
 # -*- coding: utf-8 -*-
 
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
 from ....lib.util import run_cmd, run_sudo
-from ..Cmd import Cmd
+
+if TYPE_CHECKING:
+    from ..Cmd import Cmd
 
 class Backend:
 
@@ -11,6 +16,10 @@ class Backend:
     async def _sudo(self, cmd: list[str], mod_env: dict[str, str] = {}, opts: list[str]=[]):
         return await run_sudo(cmd, mod_env=mod_env, opts=opts, interactive=self.interactive)
 
+    @property
+    def util(self):
+        return self.__parent.util
+
     @property
     def parent(self):
         return self.__parent