[NUI][TCSACR-418] Add AppBar class

[NUI][TCSACR-418] Add AppBar class

File - src/Tizen.NUI.Components/Controls/Navigation/AppBar.cs

  - Class
    [Add] public class AppBar

  - Constructor
    [Add] public AppBar()
    [Add] public AppBar(string style)
    [Add] public AppBar(AppBarStyle appBarStyle)

  - Property
    [Add] public bool AutoNavigationContent { get; set; }
    [Add] public string Title { get; set; }
    [Add] public IEnumerable<View> Actions { get; set; }
    [Add] public View NavigationContent { get; set; }
    [Add] public View TitleContent { get; set; }
    [Add] public View ActionContent { get; set; }

   - Method
    [Add] public override void ApplyStyle(ViewStyle viewStyle)

File - src/Tizen.NUI.Components/Controls/Navigation/ContentPage.cs

  - Property
    [Add] public AppBar AppBar { get; set; }

File - src/Tizen.NUI.Components/Style/Navigation/AppBarStyle.cs

  - Class
    [Add] public class AppBarStyle

  - Constructor
    [Add] public AppBarStyle()
    [Add] public AppBarStyle(AppBarStyle appBarStyle)

  - Property
    [Add] public ButtonStyle BackButton { get; set; }
    [Add] public TextLabelStyle TitleTextLabel { get; set; }
    [Add] public ViewStyle ActionView { get; set; }
    [Add] public ButtonStyle ActionButton { get; set; }

   - Method
    [Add] public override void CopyFrom(BindableObject bindableObject)

Change-Id: I96c5a3e9110dae3c6d69cc504d2f42567c318b6e