Add TSDatasets.__init__ regressors logic

[Mr-Geekman]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

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

Look #327.

Related Issue

#327.

Closing issues

Closes #327.

[iKintosh]

Typo

[Mr-Geekman]

It was decided to add all literal to select all columns in df_exog to be regressors.

[iKintosh]

👍

[codecov-commenter]

Codecov Report

Merging #357 (7f02531) into breaking_change/regressors (f0c2bfe) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@                      Coverage Diff                       @@
##           breaking_change/regressors     #357      +/-   ##
==============================================================
+ Coverage                       87.37%   87.39%   +0.02%     
==============================================================
  Files                              96       96              
  Lines                            4697     4706       +9     
==============================================================
+ Hits                             4104     4113       +9     
  Misses                            593      593              

Impacted Files	Coverage Δ
etna/datasets/tsdataset.py	92.82% <100.00%> (+0.26%)	⬆️

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