[ResponseOps][Rules] Extend the TerraForm provider to support the new capabilities of the Create Rule API

[cnasikas]

The Elastic TerraForm provider allows users to create rules using TerraForm. It uses the Create Rule API to create rules. The API evolved over time to support new features but the TF provider fell behind. We should update the TF provider to support the new capabilities.

The current model of the rule: https://github.com/elastic/terraform-provider-elasticstack/blob/eb077fd2993321ec813222c317aed0a831c6f073/internal/models/alert_rule.go

The current request schema of the Create rule API: https://github.com/elastic/kibana/blob/ac9f6233eb6675c6d5db7cef80817a4698543653/x-pack/plugins/alerting/docs/openapi/components/schemas/create_rule_request.yaml

Related: elastic/terraform-provider-elasticstack#591, #186963, https://github.com/elastic/enhancements/issues/22130, https://github.com/elastic/enhancements/issues/22131, https://github.com/elastic/enhancements/issues/22129

DoD

Beta Give feedback

1. Add support for the alert_delay attribute of the rule ( Add support for the alert_delay param in the Create Rule API terraform-provider-elasticstack#715)
2. Add support for the frequency attribute of the action (Add support for thefrequency field in the Create Rule API terraform-provider-elasticstack#753)
3. Add support for the alerts_filter attribute of the action (Add support for the alerts_filter param in the Create Rule API terraform-provider-elasticstack#774)
4. Verify that all attributes of the rule and the action are supported
5. Adding the new attributes does not introduce breaking changes to existing TF configurations
6. The new TF definition is BWC with Elastic Stack versions 7.x+
7. Update the Elastic TerraForm provider docs

[elasticmachine]

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

[shanisagiv1]

see also relates issues to Terraform, lets make sure we fix all issues with this effort. @cnasikas thanks!!
#178969
elastic/terraform-provider-elasticstack#524

[tobio]

Related to elastic/terraform-provider-elasticstack#591
IIUC the updates required for this work will immediately fix elastic/terraform-provider-elasticstack#524. LMK if you need any help in testing that one, though the issue does have some decent repro detail.

[cnasikas]

TF provider release with all the changes described in the issue: https://github.com/elastic/terraform-provider-elasticstack/releases/tag/v0.11.7