feat(Guild): Add Guild#maximumBitrate getter. (#6455)

Co-authored-by: Jiralite <33201955+Jiralite@users.noreply.github.com>
Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>
Co-authored-by: Antonio Román <kyradiscord@gmail.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/structures/Guild.js

@@ -534,6 +534,28 @@ class Guild extends AnonymousGuild {
     );
   }
 
+  /**
+   * The maximum bitrate available for this guild
+   * @type {number}
+   * @readonly
+   */
+  get maximumBitrate() {
+    if (this.features.includes('VIP_REGIONS')) {
+      return 384000;
+    }
+
+    switch (PremiumTiers[this.premiumTier]) {
+      case PremiumTiers.TIER_1:
+        return 128000;
+      case PremiumTiers.TIER_2:
+        return 256000;
+      case PremiumTiers.TIER_3:
+        return 384000;
+      default:
+        return 96000;
+    }
+  }
+
   /**
    * Fetches a collection of integrations to this guild.
    * Resolves with a collection mapping integrations by their ids.