add ability to retry cloud functions on failure

[danawillow]

Fixes #1164.

I opted to top-level this because we already have precedent in this resource for top-leveling instead of nesting, but I could be persuaded otherwise. Also, the API for this is just to send an empty Retry object if you want to enable retries, which would lead to tf configs that look like this if we kept to the API:

resource "google_cloudfunctions_function" "function" {
  name = "whatever"
  // other properties
  failure_policy {
    retry {
    }
  }
}

since right now, the only thing in a failure policy that can be set is retry, which has no attributes of its own.
(see https://cloud.google.com/functions/docs/reference/rest/v1/projects.locations.functions)

[Farhie]

Awesome, thanks @danawillow!

[ghost]

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