Add more inputs/outputs to Pass Through

[joeyballentine]

Suggested by @mrjschulte

[RunDevelopment]

What's the motivation for this?

[joeyballentine]

What's the motivation for this?

https://discord.com/channels/930865462852591648/934155622490984520/1203929089941962812

I guess it saves you needing to have multiple passthrough nodes. I'm not too sure of the usefulness myself but since it wasn't too difficult to add I don't see a reason to not do it

[mrjschulte]

Sometimes you want to be able to design a node flow that doesn't have to source all of its originating connections from the other end of the schematic. A Passthrough/Hub such as this is a great addition to the layout and flow of the processes and helps the User visually "lay out" where things need to go. Thanks for the work here @joeyballentine !

[RunDevelopment]

I just noticed that this node will interfere with our dead node elimination optimization. Since that optimization doesn't know which inputs are actually used, it can't remove unused ones. So we'll have to add another optimization to do that for us. That can be its own PR though.