Release 2.9.0

[d-a-bunin]

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

[github-actions]

🚀 Deployed on https://deploy-preview-471--etna-docs.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.60%. Comparing base (1526e36) to head (ee8bc3f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #471   +/-   ##
=======================================
  Coverage   90.60%   90.60%           
=======================================
  Files         247      247           
  Lines       16481    16481           
=======================================
  Hits        14933    14933           
  Misses       1548     1548           

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