WINDUP-243: Port Brad's Archive Hash visitor to windup 2.x

https://issues.jboss.org/browse/WINDUP-243
It's better to specify the phase than not to, IMO. The default is "MIGRATION_RULES" which isn't really right for this rule. If it were set to "IMPLICIT" then it might execute in the right phase, or it might execute at some random time later on.