[ITKGDCM] debug ITK GDCM reader for DICOM

[mathildemerle]

This PR is a draft to share with @Florent2305 and @juliencastelneau to adapt with their work.

This PR:

• Debug itkGDCMDataImageReader (from medInria) which uses directly itk::GDCMImageIO (from ITK) to read DICOM.
• Remove for now itkDCMTKDataImageReader and itkDCMTKImageIO which are both from medInria. In ITK there are itkDCMTKImageIO files compiled with Module_ITKIODCMTK at ON at ITK compilation. I tried to use this module by the way but there are not so much documentation about this ITK external module, ITKGDCM is there by default, so for now i just removed the DCMTK part from medInria to switch to GDCM. At one point (for the data sources for instance), we could add back a cleaned ITKDCMTK reader for instance. Or we could keep the previous ITKDCMTKReader and itkDCMTKImageIO in medInria, but maybe itkDCMTKImageIO could be enhanced. We'll see.

Small note: it's a draft, i did not tried on many DICOMs. It does not read DICOMDIR (as for itkDCMTKReader) fo instance, but it's a beginning.
Small note²: it seems that the DICOM code for AcquisitionTime and AcquisitionDate was switched in itkDCMTKReader.
Small note yet again: we really should avoid files in medInria beginning by the name of one of our external lib, like ITK. It creates confusion when we think that a file is from ITK but is internal :D.

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