[Feature] Polls (#2902)

no breakings hopefully

src/Discord.Net.WebSocket/API/Gateway/PollVote.cs

@@ -0,0 +1,21 @@
+using Newtonsoft.Json;
+
+namespace Discord.API.Gateway;
+
+internal class PollVote
+{
+    [JsonProperty("user_id")]
+    public ulong UserId { get; set; }
+
+    [JsonProperty("channel_id")]
+    public ulong ChannelId { get; set; }
+
+    [JsonProperty("message_id")]
+    public ulong MessageId { get; set; }
+
+    [JsonProperty("guild_id")]
+    public Optional<ulong> GuildId { get; set; }
+
+    [JsonProperty("answer_id")]
+    public ulong AnswerId { get; set; }
+}