Implement User Search Screen with Debounce Functionality

[Alpha17-2]

We need to implement a user search screen that allows users to search for other users by name. This screen should include a search input in the app bar and use a debounce mechanism to optimise the backend query process.

• Search Input Integration: The search field should be clearly visible and accessible, allowing users to enter search queries conveniently.
• Debounce Implementation: Implement a debounce effect to delay the execution of the search query until the user has stopped typing for a specified amount of time (e.g., 500 or 1000 milliseconds). This will help reduce the load on our servers and prevent the app from making excessive database queries.
• Backend Query: Develop the backend functionality to handle the search query. This should efficiently fetch user data based on the inputted search terms.
• UI Feedback: Display a loading spinner or indicator when the search is being processed. Show results dynamically as they are fetched from the backend.