Add memgraph namespace

src/memory/memory_control.cpp

@@ -1,4 +1,4 @@
-// Copyright 2021 Memgraph Ltd.
+// Copyright 2022 Memgraph Ltd.
 //
 // Use of this software is governed by the Business Source License
 // included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
@@ -15,7 +15,7 @@
 #include <jemalloc/jemalloc.h>
 #endif
 
-namespace memory {
+namespace memgraph::memory {
 
 // NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
 #define STRINGIFY_HELPER(x) #x
@@ -30,4 +30,4 @@ void PurgeUnusedMemory() {
 
 #undef STRINGIFY
 #undef STRINGIFY_HELPER
-}  // namespace memory
+}  // namespace memgraph::memory