SWITCHYARD-974 added the capability to add 0..* <eventListener class=""/> elements to both the <implementation.rules> and <implementation.bpm> components. The "class" attribute is required, and the value should implement java.util.EventListener at a minimum.

The tooling should add configuration support to match.

Changed XSD's:
common/rules/src/main/resources/org/switchyard/component/common/rules/config/model/v1/common-rules-v1.xsd
bpm/src/main/resources/org/switchyard/component/bpm/config/model/v1/bpm-v1.xsd
rules/src/main/resources/org/switchyard/component/rules/config/model/v1/rules-v1.xsd

SWITCHYARD-1033 is a dependent jira to this, since the un-used messageContentName attribute was removed from rules-v1.xsd as part of the changes.