Add py.typed support and bump version to 0.1.2

- Add py.typed file to indicate type support
- Update version from 0.1.1 to 0.1.2

Author: ivolnistov

src/fastapi_jwt_harmony/py.typed

@@ -1,3 +1,3 @@
 """Version information for fastapi-jwt-harmony."""
 
-__version__ = '0.1.1'
+__version__ = '0.1.2'