[Feature] Support options in Rest's AddRoleAsync (#2908)

Adding support for passing RequestOptions to DiscordRestClient's role
methods. Seems like it was just forgotten when the methods were added.

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -249,10 +249,10 @@ public Task<IReadOnlyCollection<GuildApplicationCommandPermission>> BatchEditGui
         public Task DeleteAllGlobalCommandsAsync(RequestOptions options = null)
             => InteractionHelper.DeleteAllGlobalCommandsAsync(this, options);
 
-        public Task AddRoleAsync(ulong guildId, ulong userId, ulong roleId)
-            => ClientHelper.AddRoleAsync(this, guildId, userId, roleId);
-        public Task RemoveRoleAsync(ulong guildId, ulong userId, ulong roleId)
-            => ClientHelper.RemoveRoleAsync(this, guildId, userId, roleId);
+        public Task AddRoleAsync(ulong guildId, ulong userId, ulong roleId, RequestOptions options = null)
+            => ClientHelper.AddRoleAsync(this, guildId, userId, roleId, options);
+        public Task RemoveRoleAsync(ulong guildId, ulong userId, ulong roleId, RequestOptions options = null)
+            => ClientHelper.RemoveRoleAsync(this, guildId, userId, roleId, options);
 
         public Task AddReactionAsync(ulong channelId, ulong messageId, IEmote emote, RequestOptions options = null)
             => MessageHelper.AddReactionAsync(channelId, messageId, emote, this, options);