Added node validation to docs examples and make them interactive #1995
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This feature is blocked by #1994, #1993 and #1992.
This PR adds the last piece for interactive node examples: node validation. Nodes will now have an error indicator like usual. When a node is missing inputs, or some inputs are invalid/incompatible, then an error will be shown. Since users can't connect nodes to required generic inputs, they are all assumed to be connected and valid.
Since the last piece has been added, I made fake nodes interactive now. Feel free to play around with them.