common/logging: Move Log::Entry declaration to a separate header

This reduces the load of requiring to include std::chrono in all files which include log.h

src/common/logging/log.h

@@ -4,7 +4,11 @@
 
 #pragma once
 
+#include <algorithm>
+#include <string_view>
+
 #include <fmt/format.h>
+
 #include "common/logging/types.h"
 
 namespace Common::Log {