Add UnfactorizedData

[wouterwln]

Adds and exports UnfactorizedData. This can be used to override the default factorization of data variables. An example of this can be found in the tests, where we manually specify a factorization over data variables to fix the issue in #355 with the Transition node.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.89%. Comparing base (9facd12) to head (05f2b1a).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
+ Coverage   84.84%   84.89%   +0.04%     
==========================================
  Files          20       20              
  Lines        1511     1516       +5     
==========================================
+ Hits         1282     1287       +5     
  Misses        229      229              

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[bvdmitri]

Super nice Wouter! I like it!!

• We need to adjust the original example linked in the issue
• We need to document the change

what would you think be the best section to document this new functionality (and the new struct)? We have a small section in the inference where we briefly touch upon running inference with missing values, but we also have a bigger section about the factorization constraints. I maybe will put the thing in the factorization constraints doc with a small note about it in the inference with missing values section. WDYT?

[bvdmitri]

Amazing @wouterwln , thanks! We can merge when CI is finished