ChangePointSegmentationTransform

[Ama16]

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?

Proposed Changes

Closing issues

closes #821

[github-actions]

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[codecov-commenter]

Codecov Report

Merging #822 (20949d0) into master (0198d11) will increase coverage by 0.09%.
The diff coverage is 97.84%.

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
+ Coverage   84.66%   84.75%   +0.09%     
==========================================
  Files         130      132       +2     
  Lines        7414     7471      +57     
==========================================
+ Hits         6277     6332      +55     
- Misses       1137     1139       +2     

Impacted Files	Coverage Δ
...sforms/decomposition/change_points_segmentation.py	97.50% <97.50%> (ø)
...tna/transforms/decomposition/base_change_points.py	97.56% <97.56%> (ø)
etna/analysis/change_points_trend/search.py	100.00% <100.00%> (ø)
etna/transforms/__init__.py	100.00% <100.00%> (ø)
etna/transforms/decomposition/__init__.py	100.00% <100.00%> (ø)
...na/transforms/decomposition/change_points_trend.py	98.78% <100.00%> (-0.17%)	⬇️

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