flowey: streamline artifact node declarations

[daprilik]

@daprilik, artifact_hypestv in particular seems like boilerplate that could be shared across all the host-side tools. Am I wrong?

Yes, I think there's certainly an avenue to consolidate that sort of common "simple rust bin" artifact logic. I think there are a few approaches on how to achieve that, though the one that I lean towards is doing something similar to SimpleFlowNode, where you can implement a special ArtifactFlowNode trait which has overrides for various artifact-specific things (e.g: bin name, etc..), and have it then impl the FlowNode for you.

Originally posted by @daprilik in #375 (comment)