add(types): nsfw field

* feat(types): add nsfw field to Guild

Reference: https://github.com/discord/discord-api-docs/commit/5e63e309bbc7e93b683b47bc8401d2d079580251

Co-authored-by: ITOH <72305210+itohatweb@users.noreply.github.com>

src/types/guilds/guild.ts

@@ -107,4 +107,6 @@ export interface Guild {
   approximatePresenceCount?: number;
   /** The welcome screen of a Community guild, shown to new members, returned when in the invite object */
   welcomeScreen?: WelcomeScreen;
+  /** `true` if this guild is designated as NSFW */
+  nsfw: boolean;
 }