minor optimization + make sure top level components are action rows (#2991)

src/Discord.Net.Rest/API/Common/Message.cs

@@ -82,7 +82,7 @@ internal class Message
     public Optional<Message> ReferencedMessage { get; set; }
 
     [JsonProperty("components")]
-    public Optional<ActionRowComponent[]> Components { get; set; }
+    public Optional<IMessageComponent[]> Components { get; set; }
 
     [JsonProperty("interaction")]
     public Optional<MessageInteraction> Interaction { get; set; }

src/Discord.Net.Rest/Entities/Messages/RestMessage.cs

@@ -171,7 +171,8 @@ namespace Discord.Rest
 
             if (model.Components.IsSpecified)
             {
-                Components = model.Components.Value.Select(x => new ActionRowComponent(x.Components.Select<IMessageComponent, IMessageComponent>(y =>
+                Components = model.Components.Value.Where(x => x.Type is ComponentType.ActionRow)
+                    .Select(x => new ActionRowComponent(((API.ActionRowComponent)x).Components.Select<IMessageComponent, IMessageComponent>(y =>
                 {
                     switch (y.Type)
                     {

src/Discord.Net.Rest/Extensions/EntityExtensions.cs

@@ -198,7 +198,7 @@ namespace Discord.Rest
                     Content = (data.Content.IsSpecified && data.Content.Value == null) ? Optional<string>.Unspecified : data.Content,
                     Embeds = data.Embeds,
                     AllowedMentions = data.AllowedMentions,
-                    Components = data.Components,
+                    Components = data.Components.GetValueOrDefault(Array.Empty<API.ActionRowComponent>()),
                     Flags = data.Flags,
                 };