[Feature] Add MessageCallData (#2934)

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

@@ -104,4 +104,7 @@ internal class Message
 
     [JsonProperty("poll")]
     public Optional<Poll> Poll { get; set; }
+
+    [JsonProperty("call")]
+    public Optional<MessageCallData> Call { get; set; }
 }

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

@@ -0,0 +1,13 @@
+using Newtonsoft.Json;
+using System;
+
+namespace Discord.API;
+
+internal class MessageCallData
+{
+    [JsonProperty("ended_timestamp")]
+    public Optional<DateTimeOffset> EndedTimestamp { get; set; }
+
+    [JsonProperty("participants")]
+    public ulong[] Participants { get; set; }
+}

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

@@ -93,6 +93,9 @@ namespace Discord.Rest
         /// <inheritdoc />
         public MessageRoleSubscriptionData RoleSubscriptionData { get; private set; }
 
+        /// <inheritdoc />
+        public MessageCallData? CallData { get; private set; }
+
         /// <inheritdoc cref="IMessage.Components"/>
         public IReadOnlyCollection<ActionRowComponent> Components { get; private set; }
         /// <summary>
@@ -272,6 +275,9 @@ namespace Discord.Rest
 
             if (model.Thread.IsSpecified)
                 Thread = RestThreadChannel.Create(Discord, new RestGuild(Discord, model.Thread.Value.GuildId.Value), model.Thread.Value);
+
+            if (model.Call.IsSpecified)
+                CallData = new MessageCallData(model.Call.Value.Participants, model.Call.Value.EndedTimestamp.ToNullable());
         }
         /// <inheritdoc />
         public async Task UpdateAsync(RequestOptions options = null)