🎨 Rework Probabilistic Regression and add Packed-Transformer layers

[alafage]

• Rework Probabilistic Regression
• Add Packed-Transformer layers
• Write documentation
• Write tests
• Update package metadata for release

[codecov]

Codecov Report

Attention: Patch coverage is 98.77193% with 7 lines in your changes missing coverage. Please review.

Project coverage is 99.15%. Comparing base (c7d870d) to head (c16d53e).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
torch_uncertainty/layers/functional/packed.py	94.89%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #126    +/-   ##
========================================
  Coverage   99.14%   99.15%            
========================================
  Files         142      143     +1     
  Lines        6817     7130   +313     
  Branches      858      910    +52     
========================================
+ Hits         6759     7070   +311     
  Misses         27       27            
- Partials       31       33     +2     

Flag	Coverage Δ
cpu	99.15% <98.77%> (+<0.01%)	⬆️
pytest	99.15% <98.77%> (+<0.01%)	⬆️

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[o-laurent]

That's well-tested! x)