Support of multimodal data in DataSourceSplitter + bugfix #1119

[kasyanovse]

1. Add support of multimodal data to cross validation
2. Add stratification for classification by default (#1119)
3. All data splitter function parameters are unified (shuffle_flag in train_test_data_setup was retained for backward compatibility)
4. Many checks added in DataSourceSplitter and train_test_data_setup
5. core.validation.split.py module is moved to core.data.cv_folds.py
6. New tests are added
7. DataObjectiveAdvisor is deleted because stratification is enable by default
8. OneFoldInputDataSplit is deleted because cv_generator get checked parameters from DataSourceSplitter. Cross validation always may be done.
9. Some old tests rely on unstratified samples. DataSourceSplitter and train_test_data_setup are called with stratify=False in that cases.

[aim-pep8-bot]

Hello @kasyanovse! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file test/unit/data/test_data_split.py:

Line 207:27: E126 continuation line over-indented for hanging indent Line 223:27: E123 closing bracket does not match indentation of opening bracket's line

Comment last updated at 2023-08-14 13:15:41 UTC

[codecov[bot]]

Codecov Report

Merging #1138 (d77ecdb) into master (04bceac) will decrease coverage by 0.12%. The diff coverage is 92.96%.

@@            Coverage Diff             @@
##           master    #1138      +/-   ##
==========================================
- Coverage   78.62%   78.51%   -0.12%     
==========================================
  Files         131      130       -1     
  Lines        9401     9336      -65     
==========================================
- Hits         7392     7330      -62     
+ Misses       2009     2006       -3     

Files Changed	Coverage Δ
fedot/api/api_utils/params.py	89.21% <ø> (-0.11%)	:arrow_down:
.../core/optimisers/objective/data_source_splitter.py	92.20% <85.29%> (-3.57%)	:arrow_down:
fedot/core/data/data_split.py	94.73% <93.84%> (+3.52%)	:arrow_up:
fedot/core/data/cv_folds.py	100.00% <100.00%> (ø)
...tations/data_operations/sklearn_transformations.py	91.20% <100.00%> (ø)

[nicl-nno]

Не забудь только pep8-замечания поправить.

[kasyanovse]

Не забудь только pep8-замечания поправить.

Поправил. Осталось два замечания, но с кодом в указанных местах все нормально.