fix(export): move ExportLimits.h to xrpl/protocol

Both xrpld.overlay and xrpl.hook depend on xrpl.protocol, so placing
the header there avoids introducing a new xrpld.overlay > xrpl.hook
levelization dependency.

Builds/levelization/results/ordering.txt

@@ -184,7 +184,6 @@ xrpld.overlay > xrpl.basics
 xrpld.overlay > xrpld.core
 xrpld.overlay > xrpld.peerfinder
 xrpld.overlay > xrpld.perflog
-xrpld.overlay > xrpl.hook
 xrpld.overlay > xrpl.json
 xrpld.overlay > xrpl.protocol
 xrpld.overlay > xrpl.resource

include/xrpl/protocol/ExportLimits.h

@@ -1,5 +1,5 @@
-#ifndef RIPPLE_HOOK_EXPORT_LIMITS_H_INCLUDED
-#define RIPPLE_HOOK_EXPORT_LIMITS_H_INCLUDED
+#ifndef RIPPLE_PROTOCOL_EXPORT_LIMITS_H_INCLUDED
+#define RIPPLE_PROTOCOL_EXPORT_LIMITS_H_INCLUDED
 
 #include <cstdint>
 

src/xrpld/app/hook/detail/applyHook.cpp

@@ -10,8 +10,8 @@
 #include <xrpld/ledger/View.h>
 #include <xrpl/basics/Log.h>
 #include <xrpl/basics/Slice.h>
-#include <xrpl/hook/ExportLimits.h>
 #include <xrpl/protocol/ErrorCodes.h>
+#include <xrpl/protocol/ExportLimits.h>
 #include <xrpl/protocol/TxFlags.h>
 #include <xrpl/protocol/st.h>
 #include <xrpl/protocol/tokens.h>

src/xrpld/overlay/detail/PeerImp.cpp

@@ -39,7 +39,7 @@
 #include <xrpl/basics/random.h>
 #include <xrpl/basics/safe_cast.h>
 #include <xrpl/beast/core/LexicalCast.h>
-#include <xrpl/hook/ExportLimits.h>
+#include <xrpl/protocol/ExportLimits.h>
 #include <xrpl/protocol/digest.h>
 
 #include <boost/algorithm/string/predicate.hpp>