Make Constant and Shared variables subclasses of the respective Variables

[ricardoV94]

Description

Related Issue

• Closes Shared and Constants are not instances of respective Variables #627
• Related to Make TensorConstant a subclass of TensorVariable aesara-devs/aesara#556

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (fba91f1) 80.82% compared to head (75bae10) 80.82%.
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #628   +/-   ##
=======================================
  Coverage   80.82%   80.82%           
=======================================
  Files         162      162           
  Lines       46743    46744    +1     
  Branches    11419    11418    -1     
=======================================
+ Hits        37781    37783    +2     
+ Misses       6717     6716    -1     
  Partials     2245     2245           

Files	Coverage Δ
pytensor/breakpoint.py	55.00% <100.00%> (ø)
pytensor/compile/compilelock.py	97.14% <ø> (ø)
pytensor/configdefaults.py	65.92% <ø> (ø)
pytensor/gradient.py	76.82% <ø> (ø)
pytensor/graph/basic.py	88.76% <100.00%> (ø)
pytensor/graph/features.py	65.31% <100.00%> (ø)
pytensor/graph/rewriting/basic.py	71.03% <100.00%> (ø)
pytensor/graph/rewriting/db.py	85.96% <100.00%> (ø)
pytensor/graph/rewriting/unify.py	99.34% <100.00%> (ø)
pytensor/link/basic.py	87.39% <100.00%> (ø)
... and 47 more