Move ActionParser to its own file

Bug: 36970783
Test: build
Change-Id: Idd5b923e4789760bb9ef67c10982b2642bc6a31a
diff --git a/init/init.cpp b/init/init.cpp
index bd09e4b..7e4eaa8 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -45,6 +45,7 @@
 #include <memory>
 #include <optional>
 
+#include "action_parser.h"
 #include "import_parser.h"
 #include "init_first_stage.h"
 #include "keychords.h"