Add get_model_relevance_table

[alex-hse-repository]

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Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Add get_model_relevance_table

Related Issue

Closing issues

[codecov-commenter]

Codecov Report

Merging #261 (ca0b3ae) into master (84dd469) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #261      +/-   ##
==========================================
+ Coverage   86.56%   86.66%   +0.09%     
==========================================
  Files          92       92              
  Lines        4429     4461      +32     
==========================================
+ Hits         3834     3866      +32     
  Misses        595      595              

Impacted Files	Coverage Δ
etna/analysis/__init__.py	100.00% <100.00%> (ø)
etna/analysis/feature_relevance/__init__.py	100.00% <100.00%> (ø)
etna/analysis/feature_relevance/relevance.py	95.83% <100.00%> (+1.71%)	⬆️
etna/analysis/feature_relevance/relevance_table.py	100.00% <100.00%> (ø)
etna/datasets/tsdataset.py	92.56% <0.00%> (-0.04%)	⬇️

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