Changes to Evaluate labels

added the new optional request property abstain

added the new optional request property responseKind

added the optional property aggregateError to the response with the 200 status

added the optional property choice to the response with the 200 status

added the optional property ordinal to the response with the 200 status

added the optional property priority to the response with the 200 status

added the new optional request property labelEvalOptions/imageDetailLevel