Move ActionManager to its own file

Bug: 36970783
Test: build
Change-Id: I08fa39052236b462249f79de1d02bf02bdbf4c84
diff --git a/init/init_test.cpp b/init/init_test.cpp
index d78aabd..0f9635f 100644
--- a/init/init_test.cpp
+++ b/init/init_test.cpp
@@ -21,6 +21,7 @@
 #include <gtest/gtest.h>
 
 #include "action.h"
+#include "action_manager.h"
 #include "action_parser.h"
 #include "builtins.h"
 #include "import_parser.h"