Add `query` parameter to `metric_alert`
Add `query` parameter to `metric_alert`

`query` is used when it is specified by the user, if not
`metric`/`tags`/`keys`/`time_aggr`/`window` is used instead.

ojongerius/terraform-provider-datadog,ojongerius/terraform-provider-datadog,ojongerius/terraform-provider-datadog