Consistent behaviour for auto validate modes

[deandreamatias]

Had several issues that related problems when use a non default autoValidateMode, like AutoValidateMode.always or AutoValidateMode.onUserInteraction.
Also, the Flutter SDK added the new AutoValidateMode.onUnfocus

In this discussion we will add all comments related with posible solutions and desired behavior

This also related with discussion #1297

Issues related:

• [General]: Can't close keyboard after error on field with user interact mode #1287
• AutovalidateMode.onUserInteraction: Is it possible to add a feature that prevents automatic focus on a field when it contains an error? #1450
• [General]: Support AutoValidateMode.onUserInteraction with debouncing  #1316
• FormBuilderDateTimePicker: Picker always showing when field is required and empty #1304
• [General]: AutovalidateMode.always shouldn't focus to first field #1457
• [General]: FormBuilderTextField do not disabled validation when set AutovalidateMode.disabled and FormBuilder parent has autovalidateMode != AutovalidateMode.disabled #1461

References

• https://api.flutter.dev/flutter/widgets/Form/autovalidateMode.html
• https://api.flutter.dev/flutter/widgets/AutovalidateMode.html
• Adds AutovalidateMode.onFocusChange to Form and FormField flutter/flutter#140962
• [Form] AutovalidateMode.onUserInteraction validates Textfields without interaction flutter/flutter#107350