[ENH] Refactor of BaseDistribution and descendants - generalised distribution param broadcasting in base class

[Alex-JG3]

Reference Issues/PRs

Copied from this PR from sktime sktime/sktime#5176

What does this implement/fix? Explain your changes.

Refactors the _get_bc_params function in the BaseDistribution class.

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

[codecov-commenter]

Codecov Report

Merging #54 (ac061b9) into main (d1b693f) will decrease coverage by 0.21%.
The diff coverage is 55.00%.

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@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   71.19%   70.98%   -0.21%     
==========================================
  Files         107      107              
  Lines        4958     4950       -8     
  Branches      887      886       -1     
==========================================
- Hits         3530     3514      -16     
- Misses       1195     1201       +6     
- Partials      233      235       +2     

Files Changed	Coverage Δ
...o/distributions/tests/test_base_default_methods.py	37.93% <0.00%> (ø)
skpro/distributions/base.py	63.27% <50.00%> (-0.82%)	⬇️
skpro/distributions/laplace.py	100.00% <100.00%> (ø)
skpro/distributions/normal.py	100.00% <100.00%> (ø)
skpro/distributions/t.py	98.61% <100.00%> (-0.14%)	⬇️

[fkiraly]

Thank you!