feat(nodes): Show valid next nodes when creating an edge, or when a node is selected

[psychedelicious]

As a nodes noob, I think a cool optimization to the UI would be to show a filtered list of valid destinations when you are working a node that is a source. So if I have a MainModelLoader node that I'm working on, show a view (maybe just the search list we have now with some sort of highlighting for valid connection) that quickly shows me nodes that have inputs of unet, clip, vae that are compatible "next" nodes

#4114 (comment)

[Dekita]

Similar to UE: https://cdn.discordapp.com/attachments/1130288930319761428/1151877908974014484/nodeexample.gif

I agree, this is a much needed feature for workflow noobs like me :)