feat(eventsub): create conduit websocket pool helper

[iProdigy]

Prerequisites for Code Changes

• This pull request follows the code style of the project
• I have tested this feature

Changes Proposed

• Fire EventSocketWelcomedEvent
• Create TwitchConduitSocketPool

Additional Information

Follow-up to #923

Sample usage:

IEventSubConduit conduit = TwitchConduitSocketPool.create(spec -> {
    spec.clientId("your-client-id");
    spec.clientSecret("your-client-secret");
    spec.poolShards(4); // customizable pool size
});
conduit.register(SubscriptionTypes.STREAM_ONLINE, b -> b.broadcasterUserId("71092938").build());
conduit.getEventManager().onEvent(StreamOnlineEvent.class, System.out::println);