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
Evan Mattson