chore: update compatibility with Flutter 3.47

[RmanAkbarzadeh]

Description

This PR updates the package for Flutter 3.47.1 and migrates the existing Material and Cupertino UI code to the new standalone material_ui and cupertino_ui packages.

Changes

• Updated Flutter compatibility to 3.47
• Migrated package:flutter/material.dart to package:material_ui/material_ui.dart
• Migrated package:flutter/cupertino.dart to package:cupertino_ui/cupertino_ui.dart
• Updated affected imports to work with the standalone UI packages

Validation

• flutter analyze — passed

Notes

This is a compatibility and migration update. No intentional changes have been made to the package's existing behavior or functionality.

[RmanAkbarzadeh]

@xvrh After your changes to remove cupertino.dart and material.dart, I made the same changes here. I also migrated only the examples and tests to the standalone material_ui and cupertino_ui packages to avoid the deprecation issues expected in November.
Note: Although we should consider the fact that these changes require a minimum of Dart 3.12.0 and Flutter 3.44.0, considering the direction of Flutter’s development roadmap, we will likely need to upgrade to these versions in the near future anyway.

[xvrh]

@RmanAkbarzadeh if only example & test uses material_ui, we don't need it in pubspec > dependencies, just in dev_dependencies no?

[RmanAkbarzadeh]

@xvrh You're right. I moved them to dev_dependencies.