AWSIntegration response obj missing aws account id

[rjhornsby]

Describe the bug
The API docs describe[1] the response to api.AwsIntegration.list() as including the AWS account ID. This field does not seem to be present in the response.

This is not specifically an issue with the python library. Rather, it appears to be missing from the raw REST object, but I wasn't sure where else to go.

This is an issue because while the list() method returns all of the accounts, it does not return any unique id such as the aws account id or datadog-owned id that could be used in the update() method, to for example, add a tag. The python update() method's first documented argument[2] is the aws account id. The inference is that this is the unique ID expected to be used to identify the object the user wishes to modify.

Python aside for a moment and using a REST call directly (ie cURL or Insomnia), the REST api[3] itself isn't returning the AWS account id:

{
  "accounts": [
    {
      "access_key_id": "Axxxxxxxx",
      "filter_tags": [],
      "host_tags": [
        "account-name-id:corp-lab-123"
      ],
      "account_specific_namespace_rules": {},
      "excluded_regions": [],
      "metrics_collection_enabled": true,
      "errors": [],
      "cspm_resource_collection_enabled": false,
      "resource_collection_enabled": false
    }
  ]
}

To Reproduce
Steps to reproduce the behavior:

1. Retrieve the list of AWS accounts via REST https://api.ddog-gov.com/api/v1/integration/aws
2. Response object does not contain an aws account id or other DD-generated unique ID usable to identify the account in subsequent calls

Expected behavior
As per the documentation and functionality requirements, the AWS account id or another unique id for each account should be contained in the response object, such that this id could be passed back to DD in calls such as update() or delete()

Additional context
[1] https://docs.datadoghq.com/api/latest/aws-integration/#list-all-aws-integrations
[2] https://github.com/DataDog/datadogpy/blob/master/datadog/api/aws_integration.py#L100-L107
[3] https://api.ddog-gov.com/api/v1/integration/aws

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