Scope down lastTransferTime to only ContactResource, DomainResource

and HostResource.

DomainApplication is not transferable and has no need for this
field. HostResource needs it because it can be transferred with
a domain.

This is all in service of removing the ofy().load() inside of
host's cloneProjectedAtTime.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139346925

java/google/registry/model/host/HostResource.java

@@ -92,6 +92,14 @@ public class HostResource extends EppResource implements ForeignKeyedEppResource
   @DoNotHydrate
   Key<DomainResource> superordinateDomain;
 
+  /**
+   * The time that this resource was last transferred.
+   *
+   * <p>Can be null if the resource has never been transferred.
+   */
+  @XmlElement(name = "trDate")
+  DateTime lastTransferTime;
+
   /**
    * The most recent time that the superordinate domain was changed, or null if this host is
    * external.
@@ -113,6 +121,10 @@ public class HostResource extends EppResource implements ForeignKeyedEppResource
     return nullToEmptyImmutableCopy(inetAddresses);
   }
 
+  public DateTime getLastTransferTime() {
+    return lastTransferTime;
+  }
+
   public DateTime getLastSuperordinateChange() {
     return lastSuperordinateChange;
   }
@@ -198,6 +210,11 @@ public class HostResource extends EppResource implements ForeignKeyedEppResource
       return this;
     }
 
+    public Builder setLastTransferTime(DateTime lastTransferTime) {
+      getInstance().lastTransferTime = lastTransferTime;
+      return this;
+    }
+
     @Override
     public HostResource build() {
       return super.build();