[Enhancement] Add a way to open SwipeView programatically

[lassana]

Summary

In order to open the swipe menu programmatically, we need a new Open method. There is already Close method.

API Changes

It could be either a new Open method:

var swipeView = new SwipeView ();
swipeView.Open(); // new API

or a new IsOpen property:

var swipeView = new SwipeView ();
swipeView.IsOpen = true; // new API

Intended Use Case

Consider the following UI:

To let users know that there are some buttons accessible by swipe gesture, we would also like to add a button (three dots) to open the swipe menu by tap.