bpo-44210: make importlib.metadata._meta.PackageMetadata public (GH-26299)

Signed-off-by: Filipe Laíns <lains@riseup.net>

Automerge-Triggered-By: GH:jaraco

Lib/importlib/metadata/__init__.py

@@ -15,6 +15,7 @@ import posixpath
 import collections
 
 from . import _adapters, _meta
+from ._meta import PackageMetadata
 from ._collections import FreezableDefaultDict, Pair
 from ._functools import method_cache
 from ._itertools import unique_everseen
@@ -29,6 +30,7 @@ from typing import List, Mapping, Optional, Union
 __all__ = [
     'Distribution',
     'DistributionFinder',
+    'PackageMetadata',
     'PackageNotFoundError',
     'distribution',
     'distributions',

Misc/NEWS.d/next/Library/2021-05-21-21-23-43.bpo-44210.5afQ3K.rst

@@ -0,0 +1 @@
+Make importlib.metadata._meta.PackageMetadata public.