Sync version to 2.0.1 and add PEP 561 py.typed marker

- Fix version mismatch between pyproject.toml and __init__.py
- Add py.typed for type checker support
- Export __version__ in __all__

Author: 0xMH

funda/__init__.py

@@ -16,5 +16,5 @@
 from funda.funda import Funda, FundaAPI
 from funda.listing import Listing
 
-__version__ = "2.0.0"
-__all__ = ["Funda", "FundaAPI", "Listing"]
+__version__ = "2.0.1"
+__all__ = ["Funda", "FundaAPI", "Listing", "__version__"]