Live query pubsub adapter (#2902)

* Moves LiveQuery pub/sub to adapter folder

* Adds ability to provide custom adapter for LiveQuery pubsub

* Adds test for function based adapter

* Pass all options to createSubscriber

* nits

src/Adapters/PubSub/RedisPubSub.js

@@ -0,0 +1,18 @@
+import redis from 'redis';
+
+function createPublisher({redisURL}): any {
+  return redis.createClient(redisURL, { no_ready_check: true });
+}
+
+function createSubscriber({redisURL}): any {
+  return redis.createClient(redisURL, { no_ready_check: true });
+}
+
+const RedisPubSub = {
+  createPublisher,
+  createSubscriber
+}
+
+export {
+  RedisPubSub
+}