Add missing headers

Most of these were found by breaking every redfish class handler into
its own compile unit:

When that's done, these missing headers become compile errors. We
should just fix them.

In addition, this allows us to enable automatic header checking in
clang-tidy using misc-header-cleaner. Because the compiler can now
"see" all the defines, it no longer tries to remove headers that it
thinks are unused.

[1] https://github.com/openbmc/bmcweb/commit/4fdee9e39e9f03122ee16a6fb251a380681f56ac

Tested: Code compiles.

Change-Id: Ifa27ac4a512362b7ded7cc3068648dc4aea6ad7b
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/trigger.hpp b/redfish-core/lib/trigger.hpp
index 9ea886e..a6101a2 100644
--- a/redfish-core/lib/trigger.hpp
+++ b/redfish-core/lib/trigger.hpp
@@ -9,6 +9,7 @@
 #include "utility.hpp"
 #include "utils/collection.hpp"
 #include "utils/dbus_utils.hpp"
+#include "utils/json_utils.hpp"
 #include "utils/telemetry_utils.hpp"
 #include "utils/time_utils.hpp"