fix: add missing imports

Author: karenc-bq

Diff for: driver/cache_map.h

@@ -30,6 +30,7 @@
 #ifndef __CACHE_MAP__
 #define __CACHE_MAP__
 
+#include <atomic>
 #include <chrono>
 #include <memory>
 #include <unordered_map>

Diff for: driver/custom_endpoint_monitor.cc

@@ -30,6 +30,10 @@
 #include "custom_endpoint_monitor.h"
 
 #include <aws/core/auth/AWSCredentialsProviderChain.h>
+#include <aws/rds/model/DBClusterEndpoint.h>
+#include <aws/rds/model/DescribeDBClusterEndpointsRequest.h>
+#include <aws/rds/model/Filter.h>
+#include <vector>
 
 #include "allowed_and_blocked_hosts.h"
 #include "aws_sdk_helper.h"