[feature] 유저 서비스 & JWT 인증 추가

[wiggleji]

• userService
  • 로그인/회원가입/조회 기능
  • 테스트케이스 추가
• JWT
  • tokenProvider: JWT 인증 발급/검증
  • tokenAuthenticationFilter: web security에서 user/password 인증 이전에 JWT 인증 실행

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	Secret	Commit	Filename
4130252	Generic High Entropy Secret	a47972f	src/main/resources/application.yml	View secret
4130252	Generic High Entropy Secret	05b1b4a	target/classes/application.yml	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secrets safely. Learn here the best practices.
3. Revoke and rotate these secrets.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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<sup>🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.

Our GitHub checks need improvements? Share your feedbacks!</sup>

[wiggleji]

JWT 발급/인증용 토큰은 비공개처리 하지 않고 바로 적용.
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