Robustify how we handle dims

[tomicapretto]

Closes #681 #651

[codecov-commenter]

Codecov Report

Merging #682 (bb0ab38) into main (d3b4f05) will decrease coverage by 0.25%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
- Coverage   88.65%   88.41%   -0.25%     
==========================================
  Files          40       40              
  Lines        2848     2858      +10     
==========================================
+ Hits         2525     2527       +2     
- Misses        323      331       +8     

Impacted Files	Coverage Δ
bambi/priors/scaler.py	96.70% <ø> (ø)
bambi/families/family.py	92.85% <60.00%> (-1.94%)	⬇️
bambi/families/univariate.py	96.12% <71.42%> (-1.50%)	⬇️
bambi/backend/model_components.py	100.00% <100.00%> (ø)
bambi/backend/terms.py	96.47% <100.00%> (ø)
bambi/model_components.py	88.88% <100.00%> (-0.93%)	⬇️
bambi/models.py	78.65% <100.00%> (+0.06%)	⬆️

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