User Module | List User Feature

# List User Process

### User Story
As a librarian, I need to view a list of all registered users in the application. This list should include user details like IDs, names, contact information, profile images, etc. This feature will help me manage user accounts and address account-related issues efficiently.

### Task

- [x] Implement Data Access Object (DAO) Layer.
- [x] Implement Service Layer.
- [x] Create JUnit Test Cases.
- [x] Ensure that the tests cases are passing.
- [x] Write clear and concise comments in the code to explain complex logic.

#### DAO
- getAllUsers()

#### Service
- listAllUser()

#### Junit Test
- testGetAllUsers()

### Estimation
- 1 hour

# Flowchart

```mermaid
graph TD
A[[Start]] --> B([Librarian Accesses User List])
B --> C[(Retrieve List of User from Database)]
C --> |No User Found| F{{ServiceException}}
C --> |List of User Found| I([Login Successful])
F --> G([Failed to Retrieve User List])
G --> H[[End]]
I --> H

style I fill:#dfd,stroke:#333
style G fill:#fdd,stroke:#333