[G2M] Plotly callback for when plot is ready

[kc-leung]

• Added callback function for plotly & map when it is rendered

This helps the dashboard side to tell all the widgets are loaded/rendered

https://user-images.githubusercontent.com/46459367/201698671-ad756236-9a2e-4c62-b638-57172329f0dc.mov

[github-actions[bot]]

📚 Storybook preview (updated to fe696c936f302a8e8139bf8ff8d4d1fc7a959074)

[kc-leung]

@kc-leung Could we please have a recording to demonstrate how this helps in snoke-dashboard with the PDF loading?

sure, I just added video above in description