Update version to 2.3.0 (#4171)

- Update version to 2.3.0
- Update RELEASE_NOTES.md. Remove commits that forget to squash when PRs were merged, and some updates on commit messages

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Co-authored-by: James Marsh <mrshnja@amazon.co.uk>
Co-authored-by: liang.he@intel.com <liang.he@intel.com>
Co-authored-by: TianlongLiang <111852609+TianlongLiang@users.noreply.github.com>

Author: 4 people