[feat] Add support for chat stickers

This commit adds support for chat stickers by allowing users to use stickers in chat message window.
The users can toggle show additional asset list using a button.
Added Additional assets file extension data.
Additional assets list shows preview.
Optimized render when use streaming api. (prevent markdown again when message not changed)
Added controls to Video/Audio Assets

src/lang/ko.ts

@@ -280,6 +280,7 @@ export const languageKorean = {
     backgroundHTML: "백그라운드 임베딩",
     copied: "복사됨",
     useChatCopy: "채팅 메시지 복사 사용",
+    useChatSticker: "채팅 스티커 사용",
     autoTranslateInput: "입력 자동 번역",
     enterMessageForTranslateToEnglish: "영어로 번역할 메시지를 입력해주세요",
     imageCompression: "이미지 압축",