[Feature] Components V2 (#3065)

* oh well. at least it runs

* well that's some breakings

* all the models (i think)

* barebones builder impl

* commit

* initial take on `WithX` component builder design

* actually usable stuff now

* few more changes

* fixes, changes, syntax sugar

* rework message flags + auto add `ComponentsV2`

* apparently it's also nullable

* fix build

* webhook component supports + builder validations + some xmldoc

* `ResolvedUnfurledMediaItem` + fix missing accessory on sections

* missing xmldoc

* fix modal + whatever change

* yeet unused dep

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

@@ -0,0 +1,26 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+internal class TextDisplayComponent : IMessageComponent
+{
+    [JsonProperty("type")]
+    public ComponentType Type { get; set; }
+
+    [JsonProperty("id")]
+    public Optional<int> Id { get; set; }
+
+    [JsonProperty("content")]
+    public string Content { get; set; }
+
+    public TextDisplayComponent() { }
+
+    public TextDisplayComponent(Discord.TextDisplayComponent component)
+    {
+        Type = component.Type;
+        Id = component.Id ?? Optional<int>.Unspecified;
+        Content = component.Content;
+    }
+
+    int? IMessageComponent.Id => Id.ToNullable();
+}