[ENH] Deprecate datatypes endgame

[TonyBagnall]

Ongoing isolation of the datatypes module, almost there. See #42 #974. This issue is to track whats left that needs doing. This is a summary issue updated on 16/4/24, once #1433 gets merged, there are the following imports outside of the datatypes module.

• [x] forecasting.tests.test_interval_wrappers: convert_to #1435
• [ ] forecasting.base.base.py: convert_to There are five calls to convert_to, one in predict, update_predict_single, two in _check_X_y, one with store_behaviour="reset", one in _predict_moving_cutoff, seems simple they use the odd parameters of store and store behaviour
• [ ] performance_metrics.forecasting.probabilisic._classes.py: convert_to, check_is_scitype and _VectorizedDF see #1436
• [ ] transformations.base.py: convert_to, check_is_scitype
• [x] transformations.tests.test_base.py: mtype_to_scitype #1434

and then have to deal with

• [ ] forecasting.base.base.py: VectorizedDF
• [ ] transformations.base.py: _VectorizedDF