[X] bug report
[ ] feature request

# Detailed description

The AWS API supports Authorization parameters as GET parameters, e.g. here's a GET request to SendMessage on SQS:

```
curl 'http://localhost:4566/000000000000/SomeQueue.fifo?Action=SendMessage&MessageGroupId=Default&MessageDeduplicationId=1615597859837&MessageBody=%7B%22gateway_id%22%3A%20%2204e73c80-3539-499c-92a4-a0b106c2f6ab%22%7D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=test%2F20210313%2Fus-east-1%2Fsqs%2Faws4_request&X-Amz-Date=20210313T011059Z&X-Amz-Expires=86400000&X-Amz-SignedHeaders=host&X-Amz-Signature=2c652c7bc9a3b75579db3d987d1e6dd056f0ac776c1e1d4ec91e2ce84e5ad3ae'
```

## Expected behavior

Should send the message and return receipt information.

## Actual behavior

Returns...

```
<?xml version="1.0" encoding="UTF-8"?>
<Error>
    <Code>NoSuchBucket</Code>
    <Message>The specified bucket does not exist</Message>
    <BucketName>000000000000</BucketName>
    <RequestID>7a62c49f-347e-4fc4-9331-6e8eEXAMPLE</RequestID>
</Error>
```

import unittest
from localstack.services.edge import is_s3_form_data
class EdgeServiceTest(unittest.TestCase):
    def test_data_contains_key_equal_is_true(self):
        data_bytes = b'AWSAccessKeyId=someId&policy=somePolicy&key=someKey&signature=someSig'
        self.assertEqual(is_s3_form_data(data_bytes), True)
    def test_s3_form_data_is_true(self):
        data_bytes = b"""--28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="Content-Type"
        text/plain
        --28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="key"
        log.txt
        --28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="AWSAccessKeyId"
        AKIAIG7AH67ANH3GAWPQ
        --28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="policy"
        somePolicy
        --28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="signature"
        hTahNRfuCxL5HEKdhXxJPwvC6IQ=
        --28f72589b2be0c9de84386b52c615990
        Content-Disposition: form-data; name="file"; filename="file"
        Hello World!
        --28f72589b2be0c9de84386b52c615990--
        """
        self.assertEqual(is_s3_form_data(data_bytes), True)
    def test_other_query_params_is_false(self):