[Feature] Voice channel status support (#2777)

* initial commit

* MOCKED CHANNELS AGRHHHHHHHH

* fix for sharded

* yup

src/Discord.Net.Core/DiscordConfig.cs

@@ -238,6 +238,11 @@ namespace Discord
         /// </summary>
         public const int MaxApplicationTagCount = 5;
 
+        /// <summary>
+        ///     Returns the maximum length of a voice channel status.
+        /// </summary>
+        public const int MaxVoiceChannelStatusLength = 500;
+      
         /// <summary>
         ///     Returns the maximum number of entitlements that can be gotten per-batch.
         /// </summary>