[Backport 2.x] Add release notes for 2.13.0 release

[vibrantvarun]

Description

backport 648 from d0a0e31

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed as per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.77%. Comparing base (c27f712) to head (8181460).

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x     #649   +/-   ##
=========================================
  Coverage     84.77%   84.77%           
  Complexity      751      751           
=========================================
  Files            59       59           
  Lines          2325     2325           
  Branches        374      374           
=========================================
  Hits           1971     1971           
  Misses          198      198           
  Partials        156      156           

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