gh-149415: Replace typing._LazyAnnotationLib with lazy import

Author: sobolevn

Lib/typing.py

@@ -28,6 +28,7 @@
 import sys
 import types
 from types import GenericAlias
+lazy import annotationlib as _lazy_annotationlib
 
 from _typing import (
     _idfunc,
@@ -163,15 +164,6 @@
     'Unpack',
 ]
 
-class _LazyAnnotationLib:
-    def __getattr__(self, attr):
-        global _lazy_annotationlib
-        import annotationlib
-        _lazy_annotationlib = annotationlib
-        return getattr(annotationlib, attr)
-
-_lazy_annotationlib = _LazyAnnotationLib()
-
 
 def _type_convert(arg, module=None, *, allow_special_forms=False, owner=None):
     """For converting None to type(None), and strings to ForwardRef."""