Don't automatically dismissSoftInput() on return pressed #8287

Is your feature request related to a problem? Please describe.
When implementing a textField with next return key type, the keyboard is dismissed and focusing another textField brings it back BUT a flick is produced.

Describe the solution you'd like
I'd like to be able to prevent the textFieldShouldReturn implementation from always dimissing soft input.

Describe alternatives you've considered
Modify the implementation for it to check a user set flag.

Additional context
The code is in https://github.com/NativeScript/NativeScript/blob/master/nativescript-core/ui/text-field/text-field.ios.ts#L69