Improve devx on MacOS

[kate-goldenring]

Right now, Akri does not compile without libudev which is not available on MacOS. I believe we can resolve this by only having workspace members be Akri's core crates (agent, controller, and discovery handlers) and having the samples and discovery handler libraries be independent of the workspace.

[diconico07]

Moving only the discovery handler libraries out of the workspace won't change anything I think. You would only move udev crate from direct dependency to indirect as the discovery handler module will pull its library.

I believe the right way to do this would be to first finish #489 and have a similar thing for discovery handlers, I wonder if this would require dropping the agent-full flavor of the agent as well.

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