waitUntilInstanceExists
suspend fun Ec2Client.waitUntilInstanceExists(request: DescribeInstancesRequest = DescribeInstancesRequest { }, retryStrategy: RetryStrategy? = null): Outcome<DescribeInstancesResponse>
suspend fun Ec2Client.waitUntilInstanceExists(block: DescribeInstancesRequest.Builder.() -> Unit): Outcome<DescribeInstancesResponse>