feat!: Generic grid bin finder

[CarloVarni]

This will complete the adaptation of the grid to an N-dimentional case. The user is now able to iterate on any axis as they like without the need to rotate their geometry.

Next step is to see how the seed finding routine can be adapted to be more general

This PR is also a bug-fix since in the past we had:

template <typename external_spacepoint_t>
boost::container::small_vector<std::size_t, 9>
Acts::BinFinder<external_spacepoint_t>::findBins(
    std::size_t phiBin, std::size_t zBin,
    const Acts::SpacePointGrid<external_spacepoint_t>* binnedSP) const {
  // if zBinNeighbors is not defined, get the indices using
  // neighborHoodIndices
  if (m_zBinNeighbors->empty()) {
    return binnedSP->neighborHoodIndices({phiBin, zBin}).collect();
  }
  // if the zBinNeighbors is defined, get the indices from there
  std::array<std::pair<int, int>, 2> sizePerAxis;
  sizePerAxis.at(0) = std::make_pair(-m_numPhiNeighbors, m_numPhiNeighbors);
  sizePerAxis.at(1) = (*m_zBinNeighbors)[zBin - 1];
  return binnedSP->neighborHoodIndices({phiBin, zBin}, sizePerAxis).collect();
}

In the case m_zBinNeighbors is empty, the code is instructed to search neighbours in the range {-1, 1} FOR EVERY AXIS (this is what binnedSP->neighborHoodIndices({phiBin, zBin}).collect(); does), thus overwriting the value set by the user for m_numPhiNeighbors.

Now, the axes are treated independently

This requires: #2835

Invalidated by push of 9e408e0

Invalidated by push of cbe587c

[paulgessinger]

@niermann999 @CarloVarni That's one of the reasons I want to push getting C++20 going as soon as possible so we can use the standard library for this kind of stuff.

[acts-project-service]

🔴 Athena integration test results [8bb1bae]

Build job with this PR failed!

Please investigate the build job for the pipeline!