KF: remove unused CbmTofTrackFitterKF

KF: remove unused CbmTofTrackFitterKF and base CbmTofTrackFitter classes

requested review from @s.zharko

assigned to @se.gorbunov

Dear @f.uhlig, @p.-a.loizeau, @karpushkin_AT_inr.ru, @ma.beyer, @n.herrmann, @i.deppner, @se.gorbunov, @s.zharko, @v.friese,

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added CodeOwners label

merged

added KF label