ThriftHandler → DataMgr Relation

File in ThriftHandler	Includes file in DataMgr
CommandLineOptions.h	ForeignStorage / ForeignStorageCache.h
DBHandler.cpp	ForeignStorage / ArrowForeignStorage.h
DBHandler.cpp	ForeignStorage / DummyForeignStorage.h
DBHandler.cpp	ForeignStorage / PassThroughBuffer.h
ForeignTableRefreshScheduler.cpp	ForeignStorage / ForeignTableRefresh.h