Update simvastatin example with determinstic dims

[acmiyaguchi]

I was running into issues trying to display the proper names from the example final using the simvastatin example. I found out that it's because the deterministic nodes need to be annotated with dims from the group coordinates in the model. On the practice final (problem 2), my chart ends up looking like this with the correct annotations:

It doesn't actually help in this example because all the categorical variables are numbers, but maybe someone in the future might find this helpful.

As an aside, I had trouble setting up conda with the dependencies. I played around with poetry, but pgmpy pulls in pytorch, which has some really bad cross-platform dependency resolution (re python-poetry/poetry#4231 and python-poetry/poetry#6710).

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[areding]

This is great, really appreciate your contribution! After the final is graded, I'll take a closer look before merging it and also update the page's attribution with your name.