feat: Add logger to multi stepper

[benjaminhuth]

Adds a logger to the Acts::MultiEigenStepperLoop in order to see again the log messages from the step(...) function.

[codecov]

Codecov Report

Merging #1964 (eff7c4e) into main (fcdc820) will decrease coverage by 0.20%.
The diff coverage is 87.50%.

❗ Current head eff7c4e differs from pull request most recent head 00df126. Consider uploading reports for the commit 00df126 to get more accurate results

@@            Coverage Diff             @@
##             main    #1964      +/-   ##
==========================================
- Coverage   49.81%   49.62%   -0.20%     
==========================================
  Files         421      410      -11     
  Lines       23876    23303     -573     
  Branches    10836    10630     -206     
==========================================
- Hits        11895    11563     -332     
+ Misses       4366     4292      -74     
+ Partials     7615     7448     -167     

Impacted Files	Coverage Δ
.../include/Acts/Propagator/MultiEigenStepperLoop.hpp	72.04% <85.71%> (+1.93%)	⬆️
.../include/Acts/Propagator/MultiEigenStepperLoop.ipp	37.00% <100.00%> (+0.78%)	⬆️

... and 70 files with indirect coverage changes

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[github-actions]

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[andiwand]

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