🐛 Handle enter click in a NumberBox and add onEditingComplete event

[WinXaito]

Describe the bug
When a NumberBox has the focus, a click on enter should exit the focus.

It would also be great to add onEditingComplete.

[bdlukaa]

I just debugged the issue and noticed that onEditingComplete is being the root of the issue. We provide it internally, but when not provided the Enter key exists the focus. onEditingComplete also overrides the default behavior of handling according to the TextInputAction.