style(dsfr/callout): more theming for callout component

app/components/dsfr/callout_component.rb

@@ -2,11 +2,28 @@
 class Dsfr::CalloutComponent < ApplicationComponent
   renders_one :body
 
-  private
+  attr_reader :title, :theme, :icon
 
-  def initialize(title:)
+  def initialize(title:, theme: :info, icon: nil)
     @title = title
+    @theme = theme
+    @icon = icon
   end
 
-  attr_reader :title
+  def callout_class
+    ["fr-callout", theme_class, icon]
+  end
+
+  private
+
+  def theme_class
+    case theme
+    when :warning
+      "fr-callout--brown-caramel"
+    when :success
+      "fr-callout--green-emeraude"
+    else
+      # info is default theme
+    end
+  end
 end

app/components/dsfr/callout_component/callout_component.html.haml

@@ -1,3 +1,3 @@
-%div.fr-callout
+%div{ class: callout_class }
   %h3.fr-callout__title= title
   %p.fr-callout__text= body