feat: Custom z bin search order

[LuisFelipeCoelho]

This PR introduces a custom z looping feature,
which allows us to change the order in which BinnedSPGroup search for the Space Points.

In the Main branch the groups are sorted in phi and z in ascending order. But in Athena z follows the order within the vector {1, 2, 3, 4, 11, 10, 9, 8, 6, 5, 7}

This PR introduces this same custom looping approach with the vector zBinsCustomLooping. If it is not defined, the previous behaviour is preserved.

@noemina @paulgessinger @robertlangenberg

[codecov]

Codecov Report

Merging #1169 (2ba3381) into main (6ae8a95) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1169      +/-   ##
==========================================
- Coverage   47.90%   47.86%   -0.04%     
==========================================
  Files         371      371              
  Lines       19395    19411      +16     
  Branches     9135     9145      +10     
==========================================
  Hits         9291     9291              
- Misses       3773     3789      +16     
  Partials     6331     6331              

Impacted Files	Coverage Δ
Core/include/Acts/Seeding/BinnedSPGroup.hpp	0.00% <0.00%> (ø)
Core/include/Acts/Seeding/BinnedSPGroup.ipp	0.00% <0.00%> (ø)
Core/include/Acts/Seeding/SeedfinderConfig.hpp	0.00% <ø> (ø)

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[robertlangenberg]

just add a few comments to make the code easier to understand and I'm happy :)