### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

I have an application which uses SQS.
It works in production.
It has acceptance tests which were passing with localstack until very recently.

Now I see:

```
An error occurred (InvalidParameterValue) when calling the SendMessage operation: Value 0 for parameter DelaySeconds is invalid. Reason: The request include parameter that is not valid for this queue type.
```

Yes, delay `0` is being passed in to `send_message` but this used to work in both localstack and AWS.

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sqs.html#SQS.Client.send_message

> DelaySeconds (integer) --
The length of time, in seconds, for which to delay a specific message. Valid values: 0 to 900. 

### Expected Behavior

DelaySeconds 0 is a valid value.

sqs send_message works when explicitly setting delay 0.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    docker run localstack/localstack

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

1. Create a SQS FIFO queue.
2. Try to `send_message`, specifying `DelaySeconds=0`

### Environment

```markdown
- OS: macos
- LocalStack: latest
```


### Anything else?

I notice on a recent issue that @thrau said he recently changed how SQS attribute values are validated.
queue_url = sqs_create_queue()
        msg_attrs_provider = {"timestamp": {"StringValue": "1493147359900", "DataType": "Number"}}
        aws_trace_header = {
            "AWSTraceHeader": {
                "StringValue": "Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1",
                "DataType": "String",
            }
        }
        response_send = sqs_client.send_message(
            QueueUrl=queue_url, MessageBody="test", MessageAttributes=msg_attrs_provider
        )
        response_send_system_attr = sqs_client.send_message(
            QueueUrl=queue_url,
            MessageBody="test",
            MessageAttributes=msg_attrs_provider,
            MessageSystemAttributes=aws_trace_header,
        )
        assert (
            response_send["MD5OfMessageAttributes"]
            == response_send_system_attr["MD5OfMessageAttributes"]
        )
        assert response_send.get("MD5OfMessageSystemAttributes") is None
        assert (
            response_send_system_attr.get("MD5OfMessageSystemAttributes")
            == "5ae4d5d7636402d80f4eb6d213245a88"
        )
    def test_inflight_message_requeue(self, sqs_client, sqs_create_queue):