Add callouts to resources

[Paul-Bob]

Feature

Let's add native support for resources banner that should look similar to the tutorial custom implementation from https://ticketing.avodemo.com/

Must have

• Option to define title
• Option to define body, with html_safe support
• Option to define icon
• Option to define type: :info, :warning, :error, :success, which will set the color of the banner
• Option to define visibility
• Option to define URL to redirect to when clicked
• A way to use custom component where all the options are passed as attributes

Nice to have

• Option to define position: :top, :bottom
• Option to define timeout (how long the banner should be visible)
• Option to define custom color instead of using the type color

Exploratory DSL

self.callouts = [
    {
      type: :info, # :warning, :error, :success;
      visible: -> { true },
      icon: "",
      title: -> {
        "Warning sir"
      },
      body: -> {
        "alert(#{params[:id]})"
        "<span>hey</span>".html_safe
        render partial: "avo/callouts/user_callout"
        render Avo::Callouts::UserCallout.new(record: record)
      },
      # or
      renderable: -> { render partial: "avo/callouts/user_callout" },
      renderable: -> { Avo::Callouts::UserCallout.new(record: record) },
    },
  ]