[ENH] Student's t-distribution

[Alex-JG3]

Reference Issues/PRs

Mirror of sktime sktime/sktime#5050. Towards #22

What does this implement/fix? Explain your changes.

Add student's t-distribution.

Does your contribution introduce a new dependency? If yes, which one?

No

What should a reviewer concentrate their feedback on?

Any other comments?

PR checklist

For all contributions

• I've reviewed the project documentation on contributing
• I've added myself to the list of contributors.
• The PR title starts with either [ENH], [CI/CD], [MNT], [DOC], or [BUG] indicating whether
  the PR topic is related to enhancement, CI/CD, maintenance, documentation, or a bug.

For code contributions

• Unit tests have been added covering code functionality
• Appropriate docstrings have been added (see documentation standards)
• New public functionality has been added to the API Reference

[fkiraly]

Thanks!

I fixed some minor things:

• docstring example import
• first line, currently older precommit version than sktime

[codecov-commenter]

Codecov Report

Merging #49 (6bb62c4) into main (7fa2aa6) will increase coverage by 0.47%.
The diff coverage is 98.75%.

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@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   70.56%   71.03%   +0.47%     
==========================================
  Files         102      103       +1     
  Lines        4709     4789      +80     
  Branches      847      853       +6     
==========================================
+ Hits         3323     3402      +79     
  Misses       1166     1166              
- Partials      220      221       +1     

Files Changed	Coverage Δ
skpro/distributions/t.py	98.75% <98.75%> (ø)