Add type stubs for static type checking

Type stubs for the C extension and the necessary packaging config so
type checkers will find the stubs.

rel: https://www.python.org/dev/peps/pep-0561/#packaging-type-information

Author: sbdchd

hiredis/hiredis.pyi

@@ -0,0 +1,25 @@
+from typing import Any, Callable, Optional, Union
+
+class HiredisError(Exception): ...
+class ProtocolError(HiredisError): ...
+class ReplyError(HiredisError): ...
+
+class Reader:
+    def __init__(
+        self,
+        protocolError: Callable[[str], Exception] = ...,
+        replyError: Callable[[str], Exception] = ...,
+        encoding: Optional[str] = ...,
+        errors: Optional[str] = ...,
+    ) -> None: ...
+    def feed(
+        self, __buf: Union[str, bytes], __off: int = ..., __len: int = ...
+    ) -> None: ...
+    def gets(self, __shouldDecode: bool = ...) -> Any: ...
+    def setmaxbuf(self, __maxbuf: Optional[int]) -> None: ...
+    def getmaxbuf(self) -> int: ...
+    def len(self) -> int: ...
+    def has_data(self) -> bool: ...
+    def set_encoding(
+        self, encoding: Optional[str] = ..., errors: Optional[str] = ...
+    ) -> None: ...

hiredis/py.typed

@@ -27,6 +27,7 @@ def version():
   keywords=["Redis"],
   license="BSD",
   packages=["hiredis"],
+  package_data={"hiredis": ["py.typed"]},
   ext_modules=[ext],
   python_requires=">=3.6",
   classifiers=[