Add checks for @NodeChildren and @NodeChild to have consistent ordering

Author: eregon

src/main/.checkstyle_checks.xml

@@ -153,6 +153,14 @@
       <property name="format" value="\.computeIfAbsent"/>
       <property name="message" value="Use ConcurrentOperations.getOrCompute() instead of ConcurrentHashMap.computeIfAbsent() which does not scale"/>
     </module>
+    <module name="RegexpSinglelineJava">
+      <property name="format" value="@NodeChildren"/>
+      <property name="message" value="Do not use @NodeChildren, use multiple @Child annotations directly"/>
+    </module>
+    <module name="RegexpSinglelineJava">
+      <property name="format" value="@NodeChild\(type"/>
+      <property name="message" value="Use @NodeChild(value = ..., type = ...) for consistency"/>
+    </module>
   </module>
   <!--<module name="RegexpHeader">-->
     <!--<property name="header" value="/\*\n \* Copyright \(c\) (20[0-9][0-9], )?20[0-9][0-9] Oracle and/or its affiliates. All rights reserved. This\n \* code is released under a tri EPL/GPL/LGPL license. You can use it,\n \* redistribute it and/or modify it under the terms of the:\n \*\n \* Eclipse Public License version 1\.0\n \* GNU General Public License version 2\n \* GNU Lesser General Public License version 2\.1\n \*/\n"/>-->