Add plot_clusters

[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

Related Issue

Add plot_clusters to etna.analysis

Closing issues

closes #168

[codecov-commenter]

Codecov Report

Merging #169 (ad8cc15) into master (7219c3d) will decrease coverage by 0.37%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   87.42%   87.04%   -0.38%     
==========================================
  Files          73       73              
  Lines        3164     3180      +16     
==========================================
+ Hits         2766     2768       +2     
- Misses        398      412      +14     

Impacted Files	Coverage Δ
etna/analysis/plotters.py	12.90% <6.66%> (-0.67%)	⬇️
etna/analysis/__init__.py	100.00% <100.00%> (ø)

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