Merge pull request #1362 from davep/export-typing-types

Export the types that _typing.py imports and makes available

Author: davep

src/textual/_typing.py

@@ -9,3 +9,5 @@
     from typing import Final, Literal, Protocol, TypedDict
 else:
     from typing_extensions import Final, Literal, Protocol, TypedDict
+
+__all__ = ["TypeAlias", "Final", "Literal", "Protocol", "TypedDict"]