Add fields to configure new Media CDN features in networkservices/EdgeCacheService

[nahurfonseca]

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Description

Dynamic Compression is already in public preview, and it can be configured via the Restful API and gcloud CLI. This PR adds the new field compression_mode to configure dynamic compression for Media CDN via Terraform. See http://cloud/media-cdn/docs/dynamic-compression for more details.

By default, Media CDN proxies only GET, HEAD, and OPTIONS methods to your origin and filters out the methods that can modify your origin.
This PR adds the field allowed_methods to Terraform, so other methods such as PUT, POST, DELETE, and PATCH can be supported. See https://cloud.google.com/media-cdn/docs/routing#method-filtering for more details.

New or Affected Resource(s)

• google_network_services_edge_cache_service.*

Potential Terraform Configuration

resource "google_storage_bucket" "dest" {
  name          = "%s"
  location      = "US"
  force_destroy = true
}
resource "google_network_services_edge_cache_origin" "instance" {
  name           = "%s"
  origin_address = google_storage_bucket.dest.url
  description    = "The default bucket for media edge test"
  max_attempts   = 2
  timeout {
    connect_timeout = "10s"
  }
}
resource "google_network_services_edge_cache_service" "served" {
  name        = "%s"
  description = "some description"
  routing {
    host_rule {
      description  = "host rule description"
      hosts        = ["sslcert.tf-test.club"]
      path_matcher = "routes"
    }
    path_matcher {
      name = "routes"
      route_rule {
        description = "a route rule to match against"
        priority    = 1
        match_rule {
          prefix_match = "/"
        }
        origin = google_network_services_edge_cache_origin.instance.name
        route_action {
          cdn_policy {
            cache_mode  = "CACHE_ALL_STATIC"
            default_ttl = "3600s"
          }
          compression_mode = "AUTOMATIC"
        }
        route_methods {
          allowed_methods = ["GET", "HEAD", "OPTIONS", "PUT", "POST", "DELETE", "PATCH"]
        }
        header_action {
          response_header_to_add {
            header_name  = "x-cache-status"
            header_value = "{cdn_cache_status}"
          }
        }
      }
    }
  }
}

References

No response