[NUI] Create Layout only for TextLabel (#1850)

[NUI] Create Layout only for TextLabel (#1850)

There are 4 cases.

1. Fixed or MatchParent Width and Height
: Use fixed or parent size

2. Fixed or MatchParent Width and WrapContent Height
: Get Height for Width using GetHeightForWidth() API

3. WrapContent Width and Fixed or MatchParent Height
: Get Width for Height using GetNaturalSize() API because there is no
overrided GetWidthForHeight function in TextLabel.

4. WrapContent Width and Height
: Get Width and Height using GetNaturalSize() API

Padding will be automatically applied by DALi TextLabel.