Layout numerical variables with jitter, and allow categorical and numerical layouts concurrently

[JackWilb]

Does this PR close any open issues?

No

Give a longer description of what this PR addresses and why it's needed

This fixes a bug I saw from #317. When laying out by a categorical and numerical variable, it would not jitter and animate. That's because the other axis was given a fixed value, so the simulation wouldn't update the node.

Fixing this issue also allowed me to fix the issue with jittering multiple nodes with the same value when laying out by 1 numerical variable. We fix in one axis and animate the other.

Provide pictures/videos of the behavior before and after these changes (optional)

One numerical variable:

One numerical, one categorical:

Are there any additional TODOs before this PR is ready to go?

TODOs:

• [x] See if Alex has a way to fix this: https://github.com/multinet-app/multilink/pull/317#issuecomment-1177615296 (#321)

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