PLANNER-189 Provide rule metaData in ConstraintMatchTotal

[fahman]

No description provided.

[ge0ffrey]

Metadata is not activation-specific. It's Rule specific. So getting it in every activation again and again is suboptimal.

Instead do this code to translate a ConstraintMatchTotal into it's metadata:

String packageName = constraintMatchTotal.getConstraintPackage();
String ruleName = constraintMatchTotal.getConstraintName();
KieBase kieBase = ksession.getKieBase();
Rule rule = kieBase.getRule(packageName, ruleName);
return rule.getMetadata();

Given the better alternative way shown above (which doesn't require increasing the weight of a ConstraintMatchTotal), I am rejecting this issue.