Add `Text` and `TextList` Type Support to the Core APIs

[popescu-v]

Khiops v11 introduces a new data type, Text, besides Numerical and Categorical. We should support it in the Python library:

• in core/dictionary.py: in the Variable class
• in core/analysis_results.py: in the DataGridDimension and VariableStatistics classes
• in core/coclustering_results.py: in the CoclusteringDimension class Mentioned in issue Update JSON Report Structure for v11 #331 (to be addressed therein).
• in the core/helpers.py: in the deploy_coclustering helper function.
• in core/api.py:
  • supplemental number_of_text_features parameter
  • supplemental text_feature_type parameter: word|ngram|token Done in PR Prepare v11 support #367.
• update samples.py, also with Text-specific derivation rules

Idem for the TextList type.

[folmos-at-orange]

Khiops v11 introduces a new data type, Text, besides Numerical and Categorical. We should support it in the Python library:

* in `core/dictionary.py`: in the `Variable` class

* in `core/analysis_results.py`: in the `DataGridDimension` and `VariableStatistics` classes

* in `core/coclustering_results.py`: in the `CoclusteringDimension` class

* in the `core/helpers.py`: in the `deploy_coclustering` helper function.

* in `core/api.py`:

Only for train_predictor and train_recoder.

  * supplemental `number_of_text_features` parameter

It should be max_text_features to be coherent with the rest.

Should we change max_constructed_variables to max_constructed_features for ever more coherence ?

  * supplemental `text_feature_type` parameter: `word|ngram|token`

* update `samples.py`, also with Text-specific derivation rules

Idem for the TextList type.

[popescu-v]

Sklearn counterpart: #39

[popescu-v]

For now, IMHO we should keep max_constructed_variables for coherence with the GUI.

[popescu-v]

This issue should be taken after the 11.0.0 release of khiops-samples is done.

[popescu-v]

khiops-samples:11.0.0 is out, hence this issue is ready for dev.

[popescu-v]

The core/analysis_results.py and core/coclustering_results.py updates would be done in issue #331.