Android longClick x, y, and duration support

Fix #1838 

Ruby examples:

```ruby
mobile :longClick, element: el.ref

mobile :longClick, element: el.ref, duration: 3000

mobile :longClick, x: 400, y: 297, duration: 3000

mobile :longClick, x: 0.5, y: 0.244
```

I verified each of the above cases with my app. This should probably have some JS tests before merging though so it doesn't break in the future.