unit and integration test improvement + explainer module

[technocreep]

simplified path_lib, added unit-tests

[pep8speaks]

@technocreep, my friend! There is something you should fix.

• In the file fedot_ind/core/architecture/experiment/TimeSeriesClassifierNN.py:

Line 34:39: W292 no newline at end of file

• In the file tests/unit/api/utils/test_configurator.py:

Line 1:1: F401 'pytest' imported but unused
Line 2:1: F401 'fedot_ind.api.utils.configurator.IndustrialConfigs' imported but unused
Line 64:9: W292 no newline at end of file

• In the file tests/unit/api/utils/test_saver_collections.py:

Line 25:85: E231 missing whitespace after ':'
Line 62:36: E203 whitespace before ','

• In the file tests/unit/architecture/experiment/test_TimeSeriesClassifier.py:

Line 63:104: E231 missing whitespace after ','
Line 63:121: E501 line too long (121 > 120 characters)
Line 168:1: W391 blank line at end of file

[codecov]

Codecov Report

Attention: Patch coverage is 91.09312% with 22 lines in your changes missing coverage. Please review.

Project coverage is 71.01%. Comparing base (870b4d0) to head (d160a86).
Report is 94 commits behind head on main.

Files	Patch %	Lines
...hitecture/experiment/TimeSeriesAnomalyDetection.py	28.57%	10 Missing ⚠️
.../architecture/experiment/TimeSeriesClassifierNN.py	25.00%	3 Missing ⚠️
...position/matrix_decomposition/dmd_decomposition.py	62.50%	3 Missing ⚠️
...d/core/architecture/pipelines/anomaly_detection.py	0.00%	2 Missing ⚠️
fedot_ind/api/utils/saver_collections.py	75.00%	1 Missing ⚠️
...hitecture/experiment/TimeSeriesClassifierPreset.py	90.90%	1 Missing ⚠️
fedot_ind/core/optimizer/IndustrialEvoOptimizer.py	0.00%	1 Missing ⚠️
fedot_ind/tools/explain/explain.py	99.15%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #108       +/-   ##
===========================================
+ Coverage   47.37%   71.01%   +23.64%     
===========================================
  Files         109      109               
  Lines        7059     7077       +18     
===========================================
+ Hits         3344     5026     +1682     
+ Misses       3715     2051     -1664     

Flag	Coverage Δ
unittests	71.01% <91.09%> (+23.64%)	⬆️

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