如果提示遭到封鎖，系統會填入 blockReason 和相關的 safetyRatings。
簽名：
export interface PromptFeedback
屬性
| 屬性 | 類型 | 說明 |
|---|---|---|
| blockReason | BlockReason | |
| blockReasonMessage | 字串 | |
| safetyRatings | SafetyRating[] |
PromptFeedback.blockReason
簽名：
blockReason: BlockReason;
PromptFeedback.blockReasonMessage
簽名：
blockReasonMessage?: string;
PromptFeedback.safetyRatings
簽名：
safetyRatings: SafetyRating[];