Python: Add declarative workflow runtime (#2815)

* Further support for declarative python workflows

* Add tests. Clean up for typing and formatting

* Improvements and cleanup

* Typing cleanup. Improve docstrings

* Proper code in docstrings

* Fix malformed code-block directive in docstring

* Remove dead links

* PR feedback

* Address PR feedback

* Address PR feedback

* Remove sl

* Update devui frontend

* More cleanup

* Fix uv lock

* Skip Py 3.14 tests as powerfx doesn't support it

* Fix mypy error

* Fix for tool calls

* Removed stale docstring

* Fix lint

* Standardize on .NET namespaces. Revert DevUI changes (bring in later)

* Implement remaining items for Python declarative support to match dotnet

python/.vscode/settings.json

@@ -18,9 +18,6 @@
     },
     "python.analysis.autoFormatStrings": true,
     "python.analysis.importFormat": "relative",
-    "python.analysis.exclude": [
-        "samples/semantic-kernel-migration"
-    ],
     "python.analysis.packageIndexDepths": [
         {
             "name": "agent_framework",