#634 `pushHistory` Flutter Event 추가

[14KGun]

Summary

It closes #634 #523

pushHistory Flutter Event를 추가하였습니다.

Images or Screenshots

• 해당 JS 코드 주입시 react-router의 페이지를 이동할 수 있습니다.

  window.dispatchEvent(new CustomEvent("pushHistory", {
    detail: "/event/2023fall"
  }));

  https://github.com/sparcs-kaist/taxi-front/assets/69258815/94aa7847-a35a-4eba-bdea-98d6d9998567

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