Multiversion gsf min finder

Provide 256bit and 128bit default multiversion vecMinThenIndex. Follow up to (!72441 (merged))

Before:
90: ------------------------------------------------------------------------------------------------------------------
90: Benchmark                                                                        Time             CPU   Iterations
90: ------------------------------------------------------------------------------------------------------------------
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::C>                          6186 ns         6096 ns       114704
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::STL>                       19144 ns        18905 ns        37008
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecAlwaysTrackIdx>          1753 ns         1739 ns       402167
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecUpdateIdxOnNewMin>        480 ns          472 ns      1483958
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecMinThenIdx>               462 ns          457 ns      1531738

After:
90: ------------------------------------------------------------------------------------------------------------------
90: Benchmark                                                                        Time             CPU   Iterations
90: ------------------------------------------------------------------------------------------------------------------
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::C>                          6512 ns         6153 ns       113458
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::STL>                       19588 ns        19006 ns        36851
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecAlwaysTrackIdx>          1809 ns         1749 ns       401041
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecUpdateIdxOnNewMin>        487 ns          474 ns      1474850
90: benchmarkFindIdxOfMinimum<findIdxOfMinimum::Impl::VecMinThenIdx>               329 ns          323 ns      2166741 <<< This is the one that matters