Add release notes for 2.18 release

[derek-ho]

Description

Adds release notes for 2.18 release

Category

Maintenance

Why these changes are required?

Release version 2.18

What is the old behavior before changes and new behavior after changes?

None

Issues Resolved

None

Testing

None

Check List

• [ ] New functionality includes testing
• [ ] New functionality has been documented
• [x] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.46%. Comparing base (506d803) to head (1ae2867). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2137 +/- ## ======================================= Coverage 71.46% 71.46% ======================================= Files 97 97 Lines 2649 2649 Branches 411 403 -8 ======================================= Hits 1893 1893 Misses 641 641 Partials 115 115 ```

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