STYLE: UseITK: Re-factor introducing _configure_IOFactoryRegisterManager
STYLE: UseITK: Re-factor introducing _configure_IOFactoryRegisterManager

Anticipating the generalization of IO factory configuration to TransformIO
and MeshIO, this commit introduces the function "_configure_IOFactoryRegisterManager".

See #3393

Change-Id: I3cdd0a9b1454823225ba383140ace6fd16d0138d

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