✨ feat : Define interface associate with the login feature

- Define user information, tokens, and login-data interface
- Manage interfaces in the index file

Related issue: YJU-OKURA#104

Author: dorimu0

src/interfaces/user/AccessToken.ts

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+interface AccessToken {
+  access_token: string;
+}
+
+export default AccessToken;

src/interfaces/user/LoginData.ts

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+import User from './User';
+
+interface LoginData {
+  access_token: string;
+  refresh_token: string;
+  user: User;
+}
+
+export default LoginData;

src/interfaces/user/RefreshToken.ts

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+interface RefreshToken {
+  refresh_token: string;
+}
+export default RefreshToken;

src/interfaces/user/User.ts

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+interface User {
+  id: number;
+  name: string;
+  image: string;
+}
+
+export default User;

src/interfaces/user/index.ts

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+import User from './User';
+import LoginData from './LoginData';
+import AccessToken from './AccessToken';
+import RefreshToken from './RefreshToken';
+
+export type {User, LoginData, AccessToken, RefreshToken};