👕 Complete metric overhaul, improve PP handling & fix Laplace

[o-laurent]

The metrics tables have been completely refactored.

[codecov]

Codecov Report

Attention: Patch coverage is 96.85039% with 4 lines in your changes missing coverage. Please review.

Project coverage is 98.85%. Comparing base (7df97be) to head (60fbe40).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
torch_uncertainty/utils/evaluation_loop.py	97.52%	2 Missing and 1 partial ⚠️
torch_uncertainty/post_processing/laplace.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   98.85%   98.85%   -0.01%     
==========================================
  Files         132      132              
  Lines        6278     6359      +81     
  Branches      858      879      +21     
==========================================
+ Hits         6206     6286      +80     
- Misses         28       29       +1     
  Partials       44       44              

Flag	Coverage Δ
cpu	98.85% <96.85%> (-0.01%)	⬇️
pytest	98.85% <96.85%> (-0.01%)	⬇️

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