Allow pipelines to be defined in TOML format with intuitive
node-and-connection syntax that's easy to read and edit.
- Add graph_toml.py with TOML parsing using tomllib
- Support simple format: "source": "headlines"
- Support full format: {"type": "camera", "mode": "scroll"}
- Parse connection strings in "A -> B -> C" chain format
- Add example pipeline_graph.toml demonstrating usage
Example TOML:
[nodes.source]
type = "source"
source = "headlines"
[nodes.camera]
type = "camera"
mode = "scroll"
[connections]
list = ["source -> camera -> display"]
