Add new resource for managing envirommnent add-ons configuration

[f0rked]

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Description

Currently there is no way of configuring add-ons for an Apigee environment althoug an API exists for that purpose

A resource is needed for managing the add-ons configuration for environments as the default configuration is to disable add-ons and we can not automate completely the environment creation using terraform.

New or Affected Resource(s)

Create new resource

• google_apigee_environment_addons_config

Potential Terraform Configuration

resource "google_apigee_environment_addons_config" "test_organization" {
  env_id = "organizations/{org_name}/environments/{env_name}"

  addons_config {
    api_security_config {
      enabled = true
    }
    analytics_config {
      enabled = true
    }
  }
}```


### References

_No response_

b/331217794