Adding search bar to extensions menu

[ctw-joao-luis]

User-Facing Changes
Adding search bar to extensions menu to facilitate user experience

Description

This PR introduces a quality-of-life (QoL) improvement by extracting the search input used for searching topics into its own reusable component. This enhancement not only facilitates reusability but also improves maintainability across the codebase.
Additionally, the related codebase has been restructured to improve readability, modularity, and testability, ensuring a better developer experience and easier future enhancements.

• Extracted the search input logic into a standalone, reusable component.
  This new component can now be used in other parts of the application where similar functionality is required.

• Improved Testing:
  Added comprehensive tests for the new reusable search input component.
  Ensured all existing functionality related to topic searching remains intact and is covered by tests.

• Enhanced Reusability:
  Simplified future usage of the search input by providing an easy-to-integrate and well-documented component interface.

Checklist

• The web version was tested and it is running ok
• The desktop version was tested and it is running ok
• This change is covered by unit tests
• Files constants.ts, types.ts and *.style.ts have been checked and relevant code snippets have been relocated

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[aneuwald-ctw]

Very good!