Get user when logged in

✅ Reference

• https://www.springcloud.io/post/2022-02/spring-security-get-current-user/#gsc.tab=0

• https://velog.io/@ke2007/jwt-%ED%98%84%EC%9E%AC-%EB%A1%9C%EA%B7%B8%EC%9D%B8%ED%95%9C-%EC%82%AC%EC%9A%A9%EC%9E%90%EC%9D%98-%EC%A0%95%EB%B3%B4%EB%A5%BC-%EC%96%BB%EC%96%B4%EC%98%AC-%EC%88%98-%EC%9E%88%EB%8A%94-%EB%B0%A9%EB%B2%95-feat.%EB%A1%9C%EA%B7%B8%EC%9D%B8-%EC%95%88%ED%96%88%EC%9C%BC%EB%A9%B4%EC%9A%94

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