types(util): add case utility types (#683)

* types(util): add case utility types

* Rename *ID to *Id

src/handlers/integrations/INTEGRATION_CREATE.ts

@@ -8,24 +8,24 @@ export function handleIntegrationCreate(
   data: DiscordPayload,
 ) {
   const {
-    guild_id: guildID,
+    guild_id: guildId,
     enable_emoticons: enableEmoticons,
     expire_behavior: expireBehavior,
     expire_grace_period: expireGracePeriod,
     subscriber_count: subscriberCount,
-    role_id: roleID,
+    role_id: roleId,
     synced_at: syncedAt,
     ...rest
   } = data.d as IntegrationCreateUpdateEvent;
 
   eventHandlers.integrationCreate?.({
     ...rest,
-    guildID,
+    guildId,
     enableEmoticons,
     expireBehavior,
     expireGracePeriod,
     syncedAt,
     subscriberCount,
-    roleID,
+    roleId,
   });
 }