Add livebook link in floweditor ui

[madclaws]

Is your feature request related to a problem? Please describe.

Right now we support adding elixir code at node level but some of the time the code may be written wrong leading to error while running the flow and it also raises warning. “InValid Code” but we can add support for livebook they can run code on the side before adding it in flow editor. Similar to Python notebook

Describe the solution you'd like
We should add a livebook link