Support XTensorSharedVariables

[ricardoV94]

Depends on pymc-devs/pytensor#1882

We were registering regular TensorSharedVariables in pymc.dims.Data, and then wrapping those in as_xtensor. The problem with that is that when you then try to act on m["x"] you were not acting on the same variable that pymc.dims.Data returned to you, instead you were acting on the input of as_xtensor...

This made it hard to adopt it in pymc-marketing

[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.03%. Comparing base (11d0f1b) to head (abfdd9e).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pymc/dims/model.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8096      +/-   ##
==========================================
- Coverage   90.89%   88.03%   -2.87%     
==========================================
  Files         123      123              
  Lines       19501    19511      +10     
==========================================
- Hits        17726    17176     -550     
- Misses       1775     2335     +560     

Files with missing lines	Coverage Δ
pymc/model/core.py	93.30% <100.00%> (ø)
pymc/model/fgraph.py	97.91% <100.00%> (-0.04%)	⬇️
pymc/model/transform/optimization.py	100.00% <100.00%> (ø)
pymc/dims/model.py	0.00% <0.00%> (-66.67%)	⬇️

... and 12 files with indirect coverage changes

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