add missing headers for new toolchain (#41)

These are necessary for compiling with Ubuntu 24.04 default toolchain/boost.

src/storage/store/StorageTarget.cc

@@ -2,6 +2,7 @@
 
 #include <boost/filesystem/operations.hpp>
 #include <folly/experimental/symbolizer/Symbolizer.h>
+#include <fstream>
 #include <sys/stat.h>
 
 #include "common/monitor/Recorder.h"

src/storage/worker/CheckWorker.cc

@@ -1,5 +1,7 @@
 #include "storage/worker/CheckWorker.h"
 
+#include <fstream>
+
 #include "common/monitor/Recorder.h"
 #include "common/utils/Duration.h"
 #include "common/utils/UtcTime.h"

src/storage/worker/DumpWorker.cc

@@ -1,6 +1,7 @@
 #include "storage/worker/DumpWorker.h"
 
 #include <gperftools/profiler.h>
+#include <fstream>
 #include <memory>
 #include <sys/times.h>