feat: add go router package and routing to the app

[SofiaRey]

Description

Routing refactored now using go_router package.

PR still as draft due to the following To Do's:

• routes.dart tests
• network_error.dart tests
• Specify content of demo videos

Demo videos

1.mov

2.mov

4.mov

3.mov

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore