Create BasePipeline

[alex-hse-repository]

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

Related Issue

Closing issues

closes #562

[iKintosh]

I think it needs some fixes.

[codecov-commenter]

Codecov Report

Merging #578 (a91b03f) into master (9ea2a81) will decrease coverage by 0.08%.
The diff coverage is 95.32%.

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
- Coverage   86.80%   86.72%   -0.09%     
==========================================
  Files         119      119              
  Lines        5739     5733       -6     
==========================================
- Hits         4982     4972      -10     
- Misses        757      761       +4     

Impacted Files	Coverage Δ
etna/ensembles/voting_ensemble.py	97.56% <85.71%> (-2.44%)	⬇️
etna/ensembles/stacking_ensemble.py	96.87% <88.88%> (-1.09%)	⬇️
etna/pipeline/autoregressive_pipeline.py	95.65% <92.30%> (-2.18%)	⬇️
etna/pipeline/pipeline.py	96.96% <92.85%> (-0.43%)	⬇️
etna/pipeline/base.py	95.78% <96.36%> (+3.89%)	⬆️
etna/ensembles/base.py	100.00% <100.00%> (ø)
etna/models/base.py	88.00% <100.00%> (+0.08%)	⬆️

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[iKintosh]

👍