[proxy](1/n) start self-vendored STL with atomic (#715)

* [proxy] start self-vendored STL

* address CR

src/test/func/client_meta/client_meta.cc

@@ -5,6 +5,7 @@
 
 #include "test/setup.h"
 
+#include <atomic>
 #include <iostream>
 #include <snmalloc/backend/globalconfig.h>
 #include <snmalloc/snmalloc_core.h>

src/test/func/miracle_ptr/miracle_ptr.cc

@@ -15,6 +15,7 @@ int main()
 
 #  include "test/setup.h"
 
+#  include <atomic>
 #  include <iostream>
 #  include <memory>
 #  include <snmalloc/backend/globalconfig.h>
@@ -201,4 +202,4 @@ int main()
 #  endif
   return 0;
 }
-#endif
+#endif

src/test/perf/low_memory/low-memory.cc

@@ -1,3 +1,4 @@
+#include <atomic>
 #include <iostream>
 #include <snmalloc/snmalloc.h>
 #include <test/opt.h>

src/test/perf/msgpass/msgpass.cc

@@ -275,7 +275,7 @@ int main(int argc, char** argv)
   /* Spawn proxies */
   for (size_t i = param.N_CONSUMER; i < param.N_QUEUE; i++)
   {
-    queue_threads[i] = std::thread(proxy, &param, i);
+    queue_threads[i] = std::thread(::proxy, &param, i);
   }
 
   /* Spawn producers */