Support Khiops coclustering Instance x Variable

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Description

The .khcj file will have new fields in Khiops 11. These relate to the new Instance x Variable feature.

Questions/Ideas

• New fields (see Prepare V11 version : internal release notes khiops#223 (comment)):
  • coclustering_type: variable | instance_variable
  • coclustering_variable

[popescu-v]

Different method for training was implemented, train_instance_variable_coclustering.