Update internals visibility and refactor API usage

Added 'Newtonsoft.Json' to InternalsVisibleTo.targets for internal visibility. Changed DiscordUnfurledMedia.Url to non-nullable. Refactored DiscordApiClient to use ToDiscordObject for deserialization, improving consistency.

Author: Lulalaby

DisCatSharp/Entities/Interaction/Components/V2Components/DiscordMediaGalleryComponent.cs

@@ -16,6 +16,7 @@ public sealed class DiscordMediaGalleryComponent : DiscordComponent
 	/// <summary>
 	///     Constructs a new <see cref="DiscordMediaGalleryComponent" />.
 	/// </summary>
+	[JsonConstructor]
 	internal DiscordMediaGalleryComponent()
 	{
 		this.Type = ComponentType.MediaGallery;
@@ -50,7 +51,7 @@ public DiscordMediaGalleryComponent(IEnumerable<DiscordMediaGalleryItem> items)
 	///     The content for the media gallery.
 	/// </summary>
 	[JsonProperty("items", NullValueHandling = NullValueHandling.Ignore)]
-	public IReadOnlyList<DiscordMediaGalleryItem> Items { get; internal set; } = [];
+	public List<DiscordMediaGalleryItem> Items { get; internal set; } = [];
 
 	/// <summary>
 	///     Assigns a unique id to the components.

DisCatSharp/Entities/Interaction/Components/V2Components/DiscordMediaGalleryItem.cs

@@ -10,6 +10,7 @@ public sealed class DiscordMediaGalleryItem
 	/// <summary>
 	///     Constructs a new empty <see cref="DiscordMediaGalleryItem" />.
 	/// </summary>
+	[JsonConstructor]
 	internal DiscordMediaGalleryItem()
 	{ }
 

DisCatSharp/Entities/Interaction/Components/V2Components/DiscordUnfurledMediaItem.cs

@@ -1,3 +1,5 @@
+using Newtonsoft.Json;
+
 namespace DisCatSharp.Entities;
 
 /// <summary>
@@ -8,6 +10,7 @@ public sealed class DiscordUnfurledMediaItem : DiscordUnfurledMedia
 	/// <summary>
 	///     Constructs a new empty <see cref="DiscordUnfurledMediaItem" />.
 	/// </summary>
+	[JsonConstructor]
 	internal DiscordUnfurledMediaItem()
 	{ }
 

DisCatSharp/Entities/Message/DiscordUnfurledMedia.cs

@@ -12,14 +12,15 @@ public class DiscordUnfurledMedia: ObservableApiObject
 	/// <summary>
 	///     Constructs a new empty <see cref="DiscordUnfurledMedia" />.
 	/// </summary>
+	[JsonConstructor]
 	internal DiscordUnfurledMedia()
 	{ }
 
 	/// <summary>
 	///     Gets the URL of the unfurled media.
 	/// </summary>
 	[JsonProperty("url", NullValueHandling = NullValueHandling.Ignore)]
-	public DiscordUri? Url { get; internal set; }
+	public DiscordUri Url { get; internal set; }
 
 	/// <summary>
 	///     Gets the proxied URL of the unfurled media.

DisCatSharp/Net/Rest/DiscordApiClient.cs

@@ -125,7 +125,7 @@ private static string BuildQueryString(Dictionary<string, string> values, bool p
 	/// <param name="msgRaw">The raw message.</param>
 	private DiscordMessage PrepareMessage(JToken msgRaw)
 	{
-		var author = msgRaw["author"].ToObject<TransportUser>();
+		var author = msgRaw["author"].ToDiscordObject<TransportUser>();
 		var ret = msgRaw.ToDiscordObject<DiscordMessage>();
 		ret.Discord = this.Discord;