Dataset libraries

[eyadgaran]

• Refactors dataset structure to provide easy inheritance for new libraries
• Refactors persistence layer to support composable patterns across libraries

[coveralls]

Pull Request Test Coverage Report for Build 1749580952

• 312 of 1039 (30.03%) changed or added relevant lines in 32 files are covered.
• 22 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+5.3%) to 18.455%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
simpleml/constants.py	0	1	0.0%
simpleml/persistables/base_persistable.py	3	4	75.0%
simpleml/registries/init.py	0	1	0.0%
simpleml/save_patterns/formats/init.py	0	1	0.0%
simpleml/save_patterns/locations/init.py	0	1	0.0%
simpleml/save_patterns/serializers/init.py	0	1	0.0%
simpleml/datasets/pandas/base.py	8	11	72.73%
simpleml/pipelines/projected_splits.py	0	4	0.0%
simpleml/registries/registry.py	25	29	86.21%
simpleml/datasets/dask/file_based.py	7	13	53.85%
<!--	Total:	312	1039	30.03%	-->

Files with Coverage Reduction	New Missed Lines	%
simpleml/models/base_model.py	1	0%
simpleml/registries/registry.py	1	72.6%
simpleml/utils/configuration.py	1	0%
simpleml/imports.py	3	19.64%
simpleml/_external/joblib.py	16	20.99%
<!--	Total:	22		-->

Totals
Change from base Build 1734609366:	5.3%
Covered Lines:	794
Relevant Lines:	4461

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💛 - Coveralls