Add Support for Signals State Management in Flutter Project Generator

[1saifj]

Is your feature request related to a problem? Please describe.
I'm looking to integrate signals state management in generated projects for improved reactive state handling. Currently, onix-flutter-project-generator lacks native support for signals, which requires additional setup and configuration. It would be beneficial to include this package as a supported option, making the generated projects more adaptable for different state management needs.

Describe the solution you'd like
I'd like to see signals added as an optional state management solution within onix-flutter-project-generator. This addition could include:

• Integrating signals as an optional dependency.
• Sample code/templates demonstrating signals usage for state management.
• Compatibility with standard modules and components in the generator.

Describe alternatives you've considered
As an alternative, manual configuration of signals is possible, but this adds extra work and reduces efficiency, especially for teams looking for a quick setup with consistent state management options across projects.

Additional context
The Signals package is a reactive state management solution suitable for applications requiring responsive and efficient UI updates. By adding this support, the onix-flutter-project-generator could offer a more flexible and modern approach to state management.