[Alerting] Add Export as CSV for all Rules

[Erikg346]

Describe the feature: Add the ability to export a CSV report of all rules/alerts in Kibana. Additional fields can be added like reciepients , type of actions, metadata information.

Describe a specific use case for the feature: We have several spaces, and it can get difficult managing all the alerts/rules we created. We were recently asked to identify all the alerts to a specific email. Although we have tagged the rules accordingly, it was still tricky to find all instances and display it in a report.

[zackmoun]

What kinds of fields should the CSV export contain? Should the export include all rules/alerts across all spaces, or be limited to just the current space?

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[Erikg346]

Hey @zackmoun Fields like rule.name, space.name , alert.conditions, last run, last updated, and recipients. I think all spaces would be better.

[cnasikas]

cc @shanisagiv1