Revert "fix: change EventDispatcher to EventProcessor + EventHandler (#272)" (#278)

This reverts commit 1b5deaa.

Author: jaeopt

DemoSwiftApp/AppDelegate.swift

@@ -99,12 +99,9 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         // 30 sec interval may be too frequent. This is for demo purpose.
         // This should be should be much larger (default = 10 mins).
         let customDownloadIntervalInSecs = 30
-        
-        let eventProcessor = BatchEventProcessor(batchSize: 10, timerInterval: 30, maxQueueSize: 1000)
 
         optimizely = OptimizelyClient(sdkKey: sdkKey,
                                        logger: customLogger,
-                                       eventProcessor: eventProcessor,
                                        periodicDownloadInterval: customDownloadIntervalInSecs,
                                        defaultLogLevel: logLevel)