feat: Add progressIndicatorBuilder

[KKimj]

// example/lib/main.dart

class MyApp extends StatelessWidget {
...
  @override
  Widget build(BuildContext context) {
...
        OneContext().progressIndicatorBuilder = (context) {
          return Center(
            child: CircularProgressIndicator(
              color: Colors.red,
            ),
          );
        };

Screen.Recording.2024-08-20.at.2.55.02.PM.mov

Hello,

I would like to propose the addition of the OneContext().progressIndicatorBuilder feature.

This feature allows users to globally set the builder when calling showProgressIndicator.

I would appreciate your feedback!

Thank you.

[emanuel-braz]

Hi @KKimj, sorry for the delay. I'm gonna check this. thank you for the contribution

[KKimj]

@emanuel-braz Thanks!