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

.pre-commit-config.yaml

@@ -115,3 +115,10 @@ repos:
         language: script
         types: [text]
         files: ^(homeassistant/.+/(manifest|strings)\.json|\.coveragerc|\.strict-typing|homeassistant/.+/services\.yaml|script/hassfest/.+\.py)$
+      - id: hassfest-metadata
+        name: hassfest-metadata
+        entry: script/run-in-env.sh python3 -m script.hassfest -p metadata
+        pass_filenames: false
+        language: script
+        types: [text]
+        files: ^(script/hassfest/.+\.py|homeassistant/const\.py$|setup\.cfg)$