TextViewProxy should support minHeight

[onwardzhang]

Right now, TextViewProxy doesn't support minHeight. https://developer.android.com/reference/android/widget/TextView#setMinHeight(int) TextView has this special property. If we don't support this, it may use the View.setMinimumHeight(int) which is supported in our ViewProxy

The value given here is different than View.setMinimumHeight(int). Between minHeight and the value set in View.setMinimumHeight(int), the greater one is used to decide the final height.

We already support minWidth for TextView, we probably should also support minHeight. I can add this.

[ngsilverman]

@onwardzhang sounds like a good addition. I'd be happy to review a pull request that adds this attribute.