Change StreamConsumerFullInfo.getSeenTime() to 'Long'

Author: sazzad16

src/main/java/redis/clients/jedis/resps/StreamConsumerFullInfo.java

@@ -42,8 +42,7 @@ public String getName() {
     return name;
   }
 
-  // TODO: Long
-  public long getSeenTime() {
+  public Long getSeenTime() {
     return seenTime;
   }