feat: Add support for dynamic Flutter build arguments

[myavuzokumus]

What does this PR do?

This PR introduces a major enhancement by adding support for dynamic flutter build windows arguments. Users can now pass arguments like --obfuscate, --split-debug-info, and --dart-define directly through the inno_build command line.

This resolves the limitation of the previous implementation, which only supported --debug and --release flags, and enables users to leverage the full power of Flutter's build capabilities for professional production builds.

Outline of the changes

• FlutterBuilder Refactored: The FlutterBuilder service is no longer limited to a few fixed parameters. It now accepts a Map<String, dynamic> of arguments, which it dynamically appends to the flutter build command.
• Dynamic Argument Parsing: The main InnoBuild class now intelligently collects all Flutter-related arguments passed to the CLI and forwards them to the FlutterBuilder.
• Easily Extensible: A new constant list, _flutterBuildOptions, has been added to make it trivial to add support for new Flutter arguments in the future without changing the core logic.
• New CLI Options: The ArgParser has been updated to officially support:
  • --obfuscate
  • --split-debug-info=<path>
  • --dart-define=<key=value> (can be used multiple times)
  • --target=<path>

How to use

After these changes, users can build their applications with advanced options:

Example 1: Build with obfuscation

dart run inno_build --release --obfuscate```

**Example 2: Split debug info and define a variable**
```bash
dart run inno_build --release --split-debug-info=build/symbols --dart-define=API_URL=https://prod.api.com

This contribution significantly increases the utility and professionalism of the package.

[izzalDev]

Dear @myavuzokumus

Thanks for your idea—it's very interesting. However, I belive it would be more dynamic and efficient to directly passthrough the flutter build windows arguments to the Flutter SDK. For example:

dart run inno_build [inno-build-options] -- [flutter-build-windows-options]

With this approach, any changes in the Flutter SDK will be automatically adapted by the program, without need to changes this code and manually parse each argument.

Note: You can use rest property from ArgParser instance to capture options that are not explicitly listed.