feat(container): implement ScalingOption

[Codelax]

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Description

A new ScalingOption object was added to containers. It replace current max_concurrency. The old field should be marked as deprecated while adding the new object.

New or Affected Resource(s)

• scaleway_container

Potential Terraform Configuration

resource scaleway_container container {
  scaling {
    concurrent_requests_threshold = 20
  }
}

[nullabe]

Hi!
As I'm very interested in this feature, I allowed myself to open a PR. You can see it here: #2876.
Don't hesitate to reach me if I did something wrong or against your standards!

Cheers