Broker plugins support

[guidograzioli]

Broker plugins

See: https://activemq.apache.org/components/artemis/documentation/latest/broker-plugins.html

Variable	Description	Default
activemq_broker_plugins	The list of broker-plugins configurations (dict: { class_name, properties(dict) })	[]

Sample:

activemq_broker_plugins:
  - class_name: org.apache.activemq.artemis.core.server.plugin.impl.LoggingActiveMQServerPlugin
    properties:
      LOG_DELIVERING_EVENTS: true
      LOG_SENDING_EVENTS: true
  - class_name: org.apache.activemq.artemis.core.server.plugin.impl.NotificationActiveMQServerPlugin
    properties:
      SEND_SESSION_NOTIFICATIONS: true