Move version metadata key to setup.cfg (#65091)

* Move version to setup.cfg
* Move python_requires to setup.cfg
* Add script to validate project metadata
* Add dedicated pre-commit hook

setup.py

@@ -31,11 +31,8 @@ PROJECT_URLS = {
 
 PACKAGES = find_packages(exclude=["tests", "tests.*"])
 
-MIN_PY_VERSION = ".".join(map(str, hass_const.REQUIRED_PYTHON_VER))
-
 setup(
     name=PROJECT_PACKAGE_NAME,
-    version=hass_const.__version__,
     url=PROJECT_URL,
     download_url=DOWNLOAD_URL,
     project_urls=PROJECT_URLS,
@@ -44,7 +41,6 @@ setup(
     packages=PACKAGES,
     include_package_data=True,
     zip_safe=False,
-    python_requires=f">={MIN_PY_VERSION}",
     test_suite="tests",
     entry_points={"console_scripts": ["hass = homeassistant.__main__:main"]},
 )