Optionally install Trigger Plugin and Restful Services Plugin as part of deployment

The Trigger Plugin (https://github.com/catalyst/moodle-tool_trigger) and the Restful Web Services Plugin (https://github.com/catalyst/moodle-webservice_restful) should be installed optionally so that the site can be configured to use the Custom Azure Logic Apps Connector for Moodle (https://github.com/catalyst/azure-connector_moodle). Not sure if we can automate the configuration of the Custom Logic App Connector - but perhaps we just have an "Enable Azure Logic Apps with Moodle" in the web UI.