Add resource definitions from Concurrency 3.0

[njr-11]

Create corresponding <context-service>, <managed-executor>, <managed-scheduled-executor>, <managed-thread-factory> definitions in deployment descriptor schema to match up with the following annotations from https://github.com/eclipse-ee4j/concurrency-api/pull/141

• ContextServiceDefinition
• ManagedExecutorDefinition
• ManagedScheduledExecutorDefinition
• ManagedThreadFactoryDefinition