feat(utils): visualize agent workflows in Mermaid #1441
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This PR adds visualization capabilities for agent workflows by using Mermaid, a code-as-diagram solution which is compatible with many different platforms (including GitHub comment markdown). This change generates Mermaid diagram code based on a
root_agent
input and then leverages https://kroki.io/ to render the Mermaid diagram code into PNG bytes which may be displayed where convenient. The visualizations may be most helpful in environments where users may have access to Jupyter notebooks or similar, creating a nice graphical experience whereby they can make decisions about and understand theirgoogle-adk
workflows from a visual perspective (see the prototype for this here).Closes #1309