Add status to transient TrackRecord class and add, but not use a new persistent class

This merge request updates the TrackRecord to include the GenParticle status. I haven't entirely decided whether this change is needed yet, so keeping it as draft for now.
Currently the value of status is not persistified, but if we switch to writing TrackCollection_p3 by default then it would be.
This merge request includes some of @averbyts's changes from !64845 (closed).

Tagging @averbyts and @pclark

LArCalorimeter/LArCnv/LArAthenaPool/src/LArTTL1ContainerCnv.cxx

+/*
+  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
+*/
+
+// Framework includes
+#include "GaudiKernel/MsgStream.h"
+
+// LArTPCnv includes
+#include "LArTPCnv/LArTTL1ContainerCnv_p1.h"
+
+// LArEventAthenaPool includes
+#include "LArTTL1ContainerCnv.h"
+
+LArTTL1Container_PERS* 
+LArTTL1ContainerCnv::createPersistent( LArTTL1Container* transCont ) 
+{
+  MsgStream msg( msgSvc(), "LArTTL1ContainerCnv" );
+
+  LArTTL1ContainerCnv_p1 cnv;
+  LArTTL1Container_PERS *persObj = cnv.createPersistent( transCont, msg );
+
+  if (msg.level()<=MSG::DEBUG)
+    msg << MSG::DEBUG << "::createPersistent [Success]" << endmsg;
+  return persObj;
+}
+
+LArTTL1Container* LArTTL1ContainerCnv::createTransient() {
+
+  MsgStream msg( msgSvc(), "LArTTL1ContainerCnv" );
+
+  LArTTL1Container *transObj = 0;
+
+  static const pool::Guid tr_guid("38FAECC7-D0C5-4DD8-8FAE-8D35F0542ECD");
+  static const pool::Guid p1_guid("b859a463-2ea4-4902-b46a-89e5fbc20132");
+
+  if ( compareClassGuid(tr_guid) ) {
+
+    // regular object from before the T/P separation
+    return poolReadObject<LArTTL1Container>();
+
+  } else if ( compareClassGuid(p1_guid) ) {
+
+    // using unique_ptr ensures deletion of the persistent object
+    std::unique_ptr<LArTTL1Container_p1> persObj( poolReadObject<LArTTL1Container_p1>() );
+    LArTTL1ContainerCnv_p1 cnv;
+    transObj = cnv.createTransient( persObj.get(), msg );
+  } else {
+    throw std::runtime_error("Unsupported persistent version of LArTTL1Container");
+  }
+
+  return transObj;
+}