### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

when executing the commands from this issue
* #5293

specifically the last command: 

    aws --debug --endpoint-url="http://localhost:4566" sqs change-message-visibility --queue-url http://localhost:4566/000000000000/MyQueue --receipt-handle garbage --visibility-timeout 30

i get the following XML response:
```xml
<ErrorResponse xmlns="http://queue.amazonaws.com/doc/2012-11-05/"><Error><Code>ReceiptHandleIsInvalid</Code><Message>The input receipt handle "garbage" is not a valid receipt handle.</Message></Error><RequestId>RC7Q6J8V0LJ4EN2WQXGANXA2XWRL13D4GN6NVJF1V8UFBAVEO417</RequestId></ErrorResponse>
```
and the following headers:
```python
{
    'Content-Type': 'text/plain; charset=utf-8',
    'Content-Length': '309',
    'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Methods': 'HEAD,GET,PUT,POST,DELETE,OPTIONS,PATCH',
    'Access-Control-Allow-Headers': 'authorization,cache-control,content-length,content-md5,content-type,etag,location,x-amz-acl,x-amz-content-sha256,x-amz-date,x-amz-request-id,x-amz-security-token,x-amz-tagging,x-amz-target,x-amz-user-agent,x-amz-version-id,x-amzn-requestid,x-localstack-target,amz-sdk-invocation-id,amz-sdk-request',
    'Access-Control-Expose-Headers': 'etag,x-amz-version-id',
    'Connection': 'close',
    'date': 'Tue, 18 Jan 2022 23:17:17 GMT',
    'server': 'hypercorn-h11',
}

```

this XML has three issues:
1. there's no `<?xml` start declaration
2. the message content is not HTML encoded (`"` should be `&quot;`)
3. the content type is `text/plain`

### Expected Behavior

The XML returned by AWS looks as follows:
```xml
<?xml version="1.0"?><ErrorResponse xmlns="http://queue.amazonaws.com/doc/2012-11-05/"><Error><Type>Sender</Type><Code>ReceiptHandleIsInvalid</Code><Message>The input receipt handle &quot;garbage&quot; is not a valid receipt handle.</Message><Detail/></Error><RequestId>bd34a56b-d17a-552a-b343-ff0b22169609</RequestId></ErrorResponse>
```
with the following response headers:
```python
{
    'x-amzn-RequestId': '3e3ad214-7356-536b-8342-88753f3af4f7',
    'Date': 'Tue, 18 Jan 2022 23:15:56 GMT',
    'Content-Type': 'text/xml',
    'Content-Length': '334',
}
```

### How are you starting LocalStack?

With the `localstack` script

### Steps To Reproduce

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

    PROVIDER_OVERRIDE_SQS=asf DEBUG=1 python -m localstack.cli.main start --host

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

```
aws --endpoint-url="http://localhost:4566" sqs create-queue --queue-name MyQueue
aws --debug --endpoint-url="http://localhost:4566" sqs change-message-visibility --queue-url http://localhost:4566/000000000000/MyQueue --receipt-handle garbage --visibility-timeout 30
```

### Environment

```markdown
- OS: Linux Mint 20
- LocalStack: latest
```

### Anything else?

Not sure this is really the root cause of #5293, but worth investigating and fixing regardless.
"""
Response serializers for the different AWS service protocols.
The module contains classes that take a service's response dict, and
given an operation model, serialize the HTTP response according to the
specified output shape.
It can be seen as the counterpart to the ``parse`` module in ``botocore``
(which parses the result of these serializer). It has a lot of
similarities with the ``serialize`` module in ``botocore``, but
serves a different purpose (serializing responses instead of requests).
The different protocols have many similarities. The class hierarchy is
designed such that the serializers share as much logic as possible.
The class hierarchy looks as follows:
::
                                      ┌───────────────────┐
                                      │ResponseSerializer │
                                      └───────────────────┘
                                          ▲    ▲      ▲
                   ┌──────────────────────┘    │      └──────────────────┐
      ┌────────────┴────────────┐ ┌────────────┴─────────────┐ ┌─────────┴────────────┐
      │BaseXMLResponseSerializer│ │BaseRestResponseSerializer│ │JSONResponseSerializer│
      └─────────────────────────┘ └──────────────────────────┘ └──────────────────────┘