Feature request: Add Prettier

**Problem**
The code base, despite existing linting rules, lacks consistent formatting, leading to:
- Reduced Readability: Inconsistent indentation, spacing, and wrapping make code harder to understand for all developers.
- Manual Formatting Waste: Developers spend time manually formatting instead of focusing on logic and functionality.

**Solution**
Introduce Prettier as a code formatter base on the [coding conventions](https://github.com/gchq/CyberChef/wiki/Contributing#coding-conventions) to enforce consistent formatting, improving readability and freeing developer time for higher-level tasks