Added search functionality to the search page allowing users to search for modules based on title or content. Also, implemented a new API endpoint for searching modules by query.

Refactor search functionality in `pages/search.vue` to include asynchronous search
operation and loading indicator. Add `loading` state to manage search loading
state. Optimize search query handling to only perform search when query value is
not empty. Implement error handling for search operations.

- Modify search form submission to trigger search operation
- Ensure search input field updates query value correctly
- Update conditional rendering of search results based on loading state
- Add `components/public/Loading.vue` component for displaying loading indicator

- Updated search functionality to use async/await for better performance.
- Added loading indicator to show search progress.
- Improved error handling during search.
- Created a loading component for visual feedback.