Move this repository to Flutter form builder ecosystem

[deandreamatias]

Please @danvick do you can move this repository owner to Flutter form builder ecosystem? And the pub package too https://pub.dev/packages/flutter_chips_input, like you did some months ago with other packages.

I will can make some refactor on readme and close some issues.

We really need update this package to fix beta build of form_builder_extra_fields.

Thanks a lot