[Discuss] Add kbn Performance Generator output for Dashboards

Similar to #20, except instead of saving the objects, we would save the requests generated by accessing the package's dashboards. The Kibana team is [adding support](https://github.com/elastic/kibana/issues/135049) for multiple tools to consume the outputs of their performance journey simulation captures. Generalizing this at the package level may actually be pretty straightforward, as an integration comes with Dashboards that could conceivably just be looped-through in the midst of our automation, or as a component of separate automation, and output here alongside Elasticsearch configuration objects. This would provide the ability to benchmark Elasticsearch not only via indexing but by simulating the loading of a package's provided Dashboards.