Release of v16.0.0

[GuptaManan100]

Includes the release notes and release commit for the v16.0.0 release. Once this PR is merged, we will be able to tag v16.0.0 on the merge commit.

Related Issues

• Release of v16.0.0 #12293

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
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Bug fixes

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Non-trivial changes

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Backward compatibility

• Protobuf changes should be wire-compatible.
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[frouioui]

LGTM