Add last aggregator to datadog_timeboard resource

[jesusvazquez]

This solves #14390

Given this configuration:

  graph = {
    title = "Consul Current Latency"
    viz = "query_value"

    request = {
        q = "avg:consul.net.node.latency.p95{$env,$consul_datacenter}"
        aggregator = "last"
        type = "line"
      }
      autoscale = true
      custom_unit = "ms"
  }

Terraform will fail planning/applying with the following error:

1 error(s) occurred:

* datadog_timeboard.consul: "graph.3.request.0.aggregator" contains an invalid method "last". Valid methods are either "average", "max", "min", or "sum"

Important Factoids

Datadog does have the last aggregator available:

The datadog api returns this value:

      {
        "definition": {
          "viz": "query_value",
          "requests": [
            {
              "q": "avg:consul.net.node.latency.p95{$env,$consul_datacenter}",
              "aggregator": "last",
              "conditional_formats": [],
              "type": "line"
            }
          ],
          "autoscale": true,
          "custom_unit": "ms"
        },
        "title": "Consul Current Latency"
      },

[stack72]

Thanks for this @jesusvazquez :) LGTM!

[ghost]

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