Upgrade Flutter & Dart, Refactor State Management, and Improve Service Locator

[yudha-haris]

What’s New:

• Flutter Upgrade: Bumped Flutter from 3.16.1 to 3.27.1.
• Dart Upgrade: Updated Dart from 3.27.1 to 3.6.0.
• State Management Changes:
  • Now using one BLoC per page to match BLoC lifecycle with the page lifecycle, so it cleans up properly when the page is closed.
• Service Locator Changes:
  • Switched from manually setting up dependencies to using annotations (injectable) to lessen the code writing
• Environment Changes:
  • Improved how we handle environment configurations using injectable

What to Improve:

• Adjust Models to latest update from DummyJson (currently the Models is deprecated)