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/include/task_messages.hpp b/redfish-core/include/task_messages.hpp
index 56ebc00..cb7b355 100644
--- a/redfish-core/include/task_messages.hpp
+++ b/redfish-core/include/task_messages.hpp
@@ -13,6 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
+#pragma once
 #include "registries/task_event_message_registry.hpp"
 
 #include <nlohmann/json.hpp>