Write REST APIs in the new mso-api-handlers/mso-api-handler-monitoring

• getServiceList(Map searchCriteria...)                                                 // invokes new getInfraRequest(Map searchCriteria...)
• getProcessInstanceId(String serviceInstanceId);                               // get the processInstanceId through GET /history/variable-instance/{id}
• getprocessDiagramXML(String processInstanceId);                          // get a process instance, get a process definition id, and get diagram
• getprocessInstanceDetail(String processInstanceId); 
• getHistoryActivityInstance(String processInstanceId);                       // GET /history/activity-instance?processInstanceId={processInstanceId}
•     getProcessInstanceParent (String processInstanceId);
•     getProcessInstanceChildren(String processInstanceId);
• getProcessTaskDetail(String processInstanceId, String taskId);
• getProcessTaskType(String processInstanceId, String taskid);        // query if this task type is "Call Activity" for drilling down