ACTS KF: Use `MbfSmoother` in ACTS KF
Similar to what we did in the ACTS Track Finding we can make use of the MbfSmoother
as an alternative to the GainMatrixSmoother
to improve CPU performance.
Similar to what we did in the ACTS Track Finding we can make use of the MbfSmoother
as an alternative to the GainMatrixSmoother
to improve CPU performance.