Add feedback vibration using Taptic Engine on iOS

[ichan-mb]

On iOS, now you can do feedback vibration by leveraging Taptic Engine. There are 9 types of vibration :

• Soft
• Rigid
• light
• Medium
• Heavy
• Success
• Warning
• Error
• Selection

To activate it, just pass those value to VibrationType property

Example

<StackPanel Margin="20">
   <!-- On iOS it will do a 'heavy' vibration using Taptic Engine -->
   <!-- On Android it will use standard vibration for a duration 0.4 second  -->
   <Button Margin="10" Text="Heavy Vibrate">
   	<Clicked>
   		<Vibrate VibrationType="Heavy" />
   	</Clicked>
   </Button>
</StackPanel>

This PR contains:

• Changelog
• Documentation
• Tests

[mortend]

Thank you!