Add py.typed file to package for mypy.

Author: RemiDesgrange

prometheus_api_client/py.typed

@@ -37,6 +37,7 @@ def get_version():
     url="https://github.com/4n4nd/prometheus-api-client-python",
     install_requires=get_install_requires(),
     packages=setuptools.find_packages(),
+    package_data={"prometheus-api-client": ["py.typed"]},
     tests_require=["httmock"],
     classifiers=[
         "Programming Language :: Python :: 3.13",