reject scxml documents with raise and no @Event at parse time
Created by: mattoshry
https://www.w3.org/TR/scxml/#raise
<scxml xmlns="http://www.w3.org/2005/07/scxml"
version="1.0" name="error-raise-event">
<state id="uber">
<transition event="*" target="fail">
<!-- missing @event -->
<raise/>
</transition>
</state>
<final id="fail"/>
</scxml>```