[Beginner][Document]Add v2.3.0 release note

[enkilee]

• [Beginner][Document]Add v2.3.0 release note OpenTenBase#8
  Modify 2.3.0.md
  Add 2.3.0-en.md
  Add 2.3.0-release-note.txt in OpenTenBase:
• [Doc]Add 2.3.0 release note OpenTenBase#53

[enkilee]

@bartdong done

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