external approval support issue's statement

[mahuihuang]

Is your feature request related to a problem?

relay_client define request Payload

https://github.com/bytebase/bytebase/blob/main/backend/plugin/app/relay/relay_client.go#L36

// CreatePayload is the message to create external approval.
type CreatePayload struct {
	IssueID     string    `json:"issueId"`
	Creator     string    `json:"creator"`
	Title       string    `json:"title"`
	Description string    `json:"description"`
	Project     string    `json:"project"`
	Statement   string    `json:"statement"`
	CreateTime  time.Time `json:"createTime"`
}

https://github.com/bytebase/bytebase/blob/main/backend/utils/utils.go#L507

actually request Payload

	id, err := relayClient.Create(node.Endpoint, &relay.CreatePayload{
		IssueID:     fmt.Sprintf("%d", issue.UID),
		Title:       issue.Title,
		Description: issue.Description,
		Project:     issue.Project.ResourceID,
		CreateTime:  issue.CreatedTime,
		Creator:     issue.Creator.Email,
	})

Describe the solution you'd like

nil

Additional context

No response