Implement log-probability for StudentTRV

[rlouf]

Follows the addition of StudentTRV in Aesara in aesara-devs/aesara#1211. Closes #185.

This is a draft, with no guarantee that the results are correct; the tests need to be expanded.

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[codecov]

Codecov Report

Base: 95.16% // Head: 95.18% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (c4ffb39) compared to base (961496a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   95.16%   95.18%   +0.01%     
==========================================
  Files          12       12              
  Lines        1945     1952       +7     
  Branches      254      254              
==========================================
+ Hits         1851     1858       +7     
  Misses         52       52              
  Partials       42       42              

Impacted Files	Coverage Δ
aeppl/logprob.py	98.07% <100.00%> (+0.03%)	⬆️

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