[FEAT]: Support Issue StateReason: Duplicate

[chagong]

Describe the need

Can you support Issue StateReason: Duplicate? GitHub API already supported it, I believe. You currently only have:

public enum ItemStateReason
    {
      /// <summary>
      /// Item closed as completed.
      /// </summary>
      [Parameter(Value = "completed")]
      Completed,

      /// <summary>
      /// Item closed as unplanned.
      /// </summary>
      [Parameter(Value = "not_planned")]
      NotPlanned,

      /// <summary>
      /// Item reopened.
      /// </summary>
      [Parameter(Value = "reopened")]
      Reopened
    }

SDK Version

14.0.0

API Version

No response

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[hugo-hoang-1701]

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