samples: Speech async examples (#612)

* Adds async examples

* Adds link to Cloud Client.

* Changes sleep duration

* Adds GCS example.

Author: gguuss

speech/snippets/src/main/java/com/example/speech/Recognize.java

@@ -172,7 +172,7 @@ public static void asyncRecognizeFile(String fileName) throws Exception, IOExcep
         speech.longRunningRecognizeAsync(config, audio);
     while (!response.isDone()) {
       System.out.println("Waiting for response...");
-      Thread.sleep(200);
+      Thread.sleep(10000);
     }
 
     List<SpeechRecognitionResult> results = response.get().getResultsList();
@@ -211,7 +211,7 @@ public static void asyncRecognizeGcs(String gcsUri) throws Exception, IOExceptio
         speech.longRunningRecognizeAsync(config, audio);
     while (!response.isDone()) {
       System.out.println("Waiting for response...");
-      Thread.sleep(200);
+      Thread.sleep(10000);
     }
 
     List<SpeechRecognitionResult> results = response.get().getResultsList();