Rename module pytensor.tensor.var to pytensor.tensor.variable

[purna135]

Fixes #421
Rename pytensor.tensor.var to pytensor.tensor.variable

Question:
do we require implementing a custom import mechanism for the module var along with issuing a deprecation warning to maintain backward compatibility?

[ricardoV94]

do we require implementing a custom import mechanism for the module var along with issuing a deprecation warning to maintain backward compatibility?

That would be great

[codecov-commenter]

Codecov Report

Merging #424 (2ab07fe) into main (288a3f3) will increase coverage by 0.00%.
The diff coverage is 88.37%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #424   +/-   ##
=======================================
  Coverage   80.77%   80.78%           
=======================================
  Files         156      157    +1     
  Lines       45571    45575    +4     
  Branches    11152    11152           
=======================================
+ Hits        36812    36816    +4     
  Misses       6552     6552           
  Partials     2207     2207           

Files Changed	Coverage Δ
pytensor/link/basic.py	87.34% <ø> (ø)
pytensor/tensor/type.py	94.48% <ø> (ø)
pytensor/tensor/variable.py	87.76% <87.76%> (ø)
pytensor/link/jax/dispatch/subtensor.py	88.13% <100.00%> (ø)
pytensor/scan/op.py	84.71% <100.00%> (ø)
pytensor/scan/rewriting.py	79.94% <100.00%> (ø)
pytensor/scan/utils.py	87.52% <100.00%> (ø)
pytensor/sparse/basic.py	82.49% <100.00%> (ø)
pytensor/tensor/basic.py	88.59% <100.00%> (ø)
pytensor/tensor/conv/abstract_conv.py	76.13% <100.00%> (ø)
... and 17 more

[ricardoV94]

Thanks @purna135