STYLE: Use itk::Math::Absolute name directly
STYLE: Rename `safe_abs` function to `Absolute` in itkMath utility
STYLE: Remove redundant casting for same types
ENH: remove redundant casting for same types
STYLE: Remove redundant `typename` in type aliases
STYLE: Remove redundant `typename` in type aliases
STYLE: Use itk::Math::Absolute name directly
STYLE: Rename `safe_abs` function to `Absolute` in itkMath utility