[Admin] Component: List of events

[justinyoo]

• endpoint: admin/events
• MUST be users with admin role

ASSUMPTION: You've logged in as an admin

[justinyoo]

story 1: 화면에 뿌려주기 #216

1. OpenAPI 명세 설계 [OpenAPI] Add endpoint for list event details #217
2. 백엔드 API 구현 [Backend API] Implement endpoint for list event details #218
3. 어드민 UI 콤포넌트 설계 [Admin] Component: List event details - UI component #219
4. 어드민 UI 콤포넌트 로직 구현 [Admin] Component: List event details - UI logic #220