fix(CommandInteractionOptionResolver): Export CommandInteractionOptio… (#6146)

**Please describe the changes this PR makes and why it should be merged:**
CommandInteractionOptionResolver is exported in the typings, but not in the index.js file

**Status and versioning classification:**
 - Code changes have been tested against the Discord API, or there are no code changes
 - I know how to update typings and have done so, or typings don't need updating

src/index.js

@@ -72,6 +72,7 @@ module.exports = {
   ClientUser: require('./structures/ClientUser'),
   Collector: require('./structures/interfaces/Collector'),
   CommandInteraction: require('./structures/CommandInteraction'),
+  CommandInteractionOptionResolver: require('./structures/CommandInteractionOptionResolver.js'),
   DMChannel: require('./structures/DMChannel'),
   Emoji: require('./structures/Emoji'),
   Guild: require('./structures/Guild'),