Add logsumexp to xtensor

[zaxtax]

Description

This adds a dim aware logsumexp function to pytensor

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):

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📚 Documentation preview 📚: https://pytensor--1629.org.readthedocs.build/en/1629/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.67%. Comparing base (b05acfd) to head (85ecc07).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1629   +/-   ##
=======================================
  Coverage   81.67%   81.67%           
=======================================
  Files         232      232           
  Lines       53132    53133    +1     
  Branches     9410     9409    -1     
=======================================
+ Hits        43396    43397    +1     
  Misses       7283     7283           
  Partials     2453     2453           

Files with missing lines	Coverage Δ
pytensor/xtensor/math.py	64.86% <100.00%> (+0.23%)	⬆️

... and 1 file with indirect coverage changes

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[ricardoV94]

Thanks @zaxtax