[FEATURE] Add ovh_cloud_project_savings_plan resource

[schirka]

Description

Is your feature request related to a problem? Please leave a brief description of the requested change.

Affected Resource(s) and/or Data Source(s)

• ovh_cloud_project
• ovh_cloud_project_savings_plan
• ovh_cloud_project_savings_plan_instances

Potential Terraform Configuration

If this request was implemented, what might the Terraform configuration look like? A best guess is helpful, even if you're unsure of exactly what the end result will look like. This helps maintainers and the community better understand how you (someone who is in need of this feature) envisions it.

Additional context

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[amstuta]

Hello @schirka,

This seems like a good idea, would a resource like the example below fit your needs ?

resource "ovh_savings_plan" "plan" {
  service_name = "id of your cloud project"
  flavor = "Rancher | C3-4 | any instance flavor ..."
  period = "P1M"
  display_name = "My saving plan"
  quantity = 2
}

The provider would then search for a saving plan offer that matches the given parameters and subscribe to it if it exists, otherwise return an error.