feat: add beartype checking for rdfproxy

beartype offers high performance runtime type checking based on type annotations.
Runtime checking can contribute to a healthier code base (see fixes)
and also allows fast failures with meaningful exceptions for library users.

Closes #152.

rdfproxy/__init__.py

@@ -1,4 +1,9 @@
+from beartype.claw import beartype_this_package
+beartype_this_package()     
+
 from rdfproxy.adapter import SPARQLModelAdapter  # noqa: F401
 from rdfproxy.mapper import ModelBindingsMapper  # noqa: F401
 from rdfproxy.utils._types import SPARQLBinding  # noqa: F401
 from rdfproxy.utils.models import Page  # noqa: F401
+
+