Feat/tap up outside

[ChreSyr]

Checklist

• [ ✅ ] I have bumped the version in pubspec.yaml
• [ ✅ ] I have added an entry in changelog.md for the new pubspec version
• [ ✅ ] (if applicable) I have added "Closes #1234" to this termplate to automatically close related issues.
• [ ✅ ] (not required if no sensible change has been made eg: Localization) I have added tests that prove my fix is effective or that my feature works.

[ChreSyr]

This PR only adds a standard TextField argument, onTapUpOutside.

onTapUpOutside is useful if you want to un-focus the field when user taps outside of it, but not when user scrolls outside of it.

[cedvdb]

thanks