= code cleanup

- for loop replaceable with enhanced 'for' loop
  - using diamond in generic type
  - collapse try catch exception
  - using try-with-resource
  - using  List#sort instead of Collections#sort
  - replaced lambda with method reference
  - using native compare method to compare numbers
  - using switch instead of if for in ESSyncUtil

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/packets/MysqlGTIDSet.java

@@ -89,8 +89,8 @@ public class MysqlGTIDSet implements GTIDSet {
             // 存在多个GTID时会有回车符
             String[] uuidStrs = gtidData.replaceAll("\n", "").split(",");
             m = new HashMap<>(uuidStrs.length);
-            for (int i = 0; i < uuidStrs.length; i++) {
-                UUIDSet uuidSet = UUIDSet.parse(uuidStrs[i]);
+            for (String uuidStr : uuidStrs) {
+                UUIDSet uuidSet = UUIDSet.parse(uuidStr);
                 m.put(uuidSet.SID.toString(), uuidSet);
             }
         }

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/packets/UUIDSet.java

@@ -80,7 +80,7 @@ public class UUIDSet {
             if (equals(o)) {
                 return 1;
             }
-            return start > o.start ? 1 : (start == o.start ? 0 : -1);
+            return Long.compare(start, o.start);
         }
     }