distutils.dist: add missing DistributionMetadata (#4763)

stdlib/3/distutils/dist.pyi

@@ -1,8 +1,57 @@
+from _typeshed import AnyPath, SupportsWrite
 from distutils.cmd import Command
-from typing import Any, Dict, Iterable, Mapping, Optional, Tuple, Type
+from typing import IO, Any, AnyStr, Dict, Iterable, List, Mapping, Optional, Tuple, Type, Union
+
+class DistributionMetadata:
+    def __init__(self, path: Optional[Union[int, AnyPath]] = ...): ...
+    name: Optional[str]
+    version: Optional[str]
+    author: Optional[str]
+    author_email: Optional[str]
+    maintainer: Optional[str]
+    maintainer_email: Optional[str]
+    url: Optional[str]
+    license: Optional[str]
+    description: Optional[str]
+    long_description: Optional[str]
+    keywords: Optional[Union[str, List[str]]]
+    platforms: Optional[Union[str, List[str]]]
+    classifiers: Optional[Union[str, List[str]]]
+    download_url: Optional[str]
+    provides: Optional[List[str]]
+    requires: Optional[List[str]]
+    obsoletes: Optional[List[str]]
+    def read_pkg_file(self, file: IO[str]) -> None: ...
+    def write_pkg_info(self, base_dir: str) -> None: ...
+    def write_pkg_file(self, file: SupportsWrite[str]) -> None: ...
+    def get_name(self) -> str: ...
+    def get_version(self) -> str: ...
+    def get_fullname(self) -> str: ...
+    def get_author(self) -> str: ...
+    def get_author_email(self) -> str: ...
+    def get_maintainer(self) -> str: ...
+    def get_maintainer_email(self) -> str: ...
+    def get_contact(self) -> str: ...
+    def get_contact_email(self) -> str: ...
+    def get_url(self) -> str: ...
+    def get_license(self) -> str: ...
+    def get_licence(self) -> str: ...
+    def get_description(self) -> str: ...
+    def get_long_description(self) -> str: ...
+    def get_keywords(self) -> Union[str, List[str]]: ...
+    def get_platforms(self) -> Union[str, List[str]]: ...
+    def get_classifiers(self) -> Union[str, List[str]]: ...
+    def get_download_url(self) -> str: ...
+    def get_requires(self) -> List[str]: ...
+    def set_requires(self, value: Iterable[str]) -> None: ...
+    def get_provides(self) -> List[str]: ...
+    def set_provides(self, value: Iterable[str]) -> None: ...
+    def get_obsoletes(self) -> List[str]: ...
+    def set_obsoletes(self, value: Iterable[str]) -> None: ...
 
 class Distribution:
     cmdclass: Dict[str, Type[Command]]
+    metadata: DistributionMetadata
     def __init__(self, attrs: Optional[Mapping[str, Any]] = ...) -> None: ...
     def get_option_dict(self, command: str) -> Dict[str, Tuple[str, str]]: ...
     def parse_config_files(self, filenames: Optional[Iterable[str]] = ...) -> None: ...