SIMD for FD spline weight calculation

[yash-quark]

Pull request description:

Introduce SIMD at FD xsec weight calculation

Changes or fixes:

• Add SIMD in splineFDBase::CalcSplineWeights()
• Convert more couts/cerrs to loggers

Examples:

Event rate comparison after and before adding SIMD:

                  FHC1Rmu_2024 |         335.305 |         335.30518
                   FHC1Re_2024 |         88.7405 |         88.74053
             FHCnumuCC1pi_2024 |          127.01 |         127.00952
              FHCnueCC1pi_2024 |         18.1957 |         18.19566
                  RHC1Rmu_2024 |         130.034 |         130.03405
                   RHC1Re_2024 |         15.9463 |         15.94626

I see that the event rates are now rounded off, but not entirely sure if this comes from SIMD or some set precision command.

[github-actions]

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