Automl-alex

Changed
- remove target encoding
- remove norm data
- rebuild cross_val
- preparation for the addition of FEs

Changed
- add Docs in functions

Fixed
- Try Fix .self buffer bug
- Fix dataset size < 1000

Changed
- Default stack_top=10 in AutoML

Changed
- predicts in DataFrame

Added
- predicts from configs

Added
- RepeatedKFold in CV for prediction.
- `n_repeats=2` in .cv()

Changed
- Stacking metamodel now `LinearModel`
- in Stacking .predict `n_repeats=2` => `n_repeats=1` (timelimit :( )

Fixed
- Fix Timelimit Error in Stacking