[Release 3.0.0-beta1] Add release notes

[prudhvigodithi]

Description

[Release 3.0.0-beta1] Add release notes

Related Issues

Part of #715 and opensearch-project/opensearch-build#3747.

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[prudhvigodithi]

Adding @cwperks @peterzhuamazon @getsaurabh02.
Thanks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.67%. Comparing base (42cc5b5) to head (4a30de1).
Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (37.67%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #758   +/-   ##
=========================================
  Coverage     37.67%   37.67%           
  Complexity      135      135           
=========================================
  Files            22       22           
  Lines          1189     1189           
  Branches        109      109           
=========================================
  Hits            448      448           
  Misses          704      704           
  Partials         37       37           

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