Allow Confirmation Prompt Styling (#1210)

* Allow Confirmation Prompt Styling

* Remove style null check

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

* Remove style null coalesce

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

* Update comment

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

* Remove style null check

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

* Update comment

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

* Remove style null coalesce

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

---------

Co-authored-by: Cédric Luthi <cedric.luthi@gmail.com>

src/Spectre.Console/Prompts/ConfirmationPrompt.cs

@@ -39,6 +39,16 @@ public sealed class ConfirmationPrompt : IPrompt<bool>
     /// </summary>
     public bool ShowDefaultValue { get; set; } = true;
 
+    /// <summary>
+    /// Gets or sets the style in which the default value is displayed. Defaults to green when <see langword="null"/>.
+    /// </summary>
+    public Style? DefaultValueStyle { get; set; }
+
+    /// <summary>
+    /// Gets or sets the style in which the list of choices is displayed. Defaults to blue when <see langword="null"/>.
+    /// </summary>
+    public Style? ChoicesStyle { get; set; }
+
     /// <summary>
     /// Gets or sets the string comparer to use when comparing user input
     /// against Yes/No choices.
@@ -72,8 +82,10 @@ public sealed class ConfirmationPrompt : IPrompt<bool>
             .InvalidChoiceMessage(InvalidChoiceMessage)
             .ValidationErrorMessage(InvalidChoiceMessage)
             .ShowChoices(ShowChoices)
+            .ChoicesStyle(ChoicesStyle)
             .ShowDefaultValue(ShowDefaultValue)
             .DefaultValue(DefaultValue ? Yes : No)
+            .DefaultValueStyle(DefaultValueStyle)
             .AddChoice(Yes)
             .AddChoice(No);