feat: Added changelog for 2.0.0 release.

[Evgenia-bit]

Checklist

• Is there an existing issue for this PR?
  • link issue here (use keywords like fix, close, resolve etc. if necessary)
• Have the files been linted and formatted?

Changes

What docs page needs to be fixed?

• Changelog

What is the problem?

What changes does this PR make to fix the problem?

[github-actions]

Link to Pyrus task

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.39%. Comparing base (1aa69b8) to head (c2790b8).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   26.31%   26.39%   +0.08%     
==========================================
  Files          55       55              
  Lines         916      917       +1     
==========================================
+ Hits          241      242       +1     
  Misses        675      675              

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