Support amazon_s3_takeover test

[aborovsky]

Add support for the amazon_s3_takeover test type to enable the "Amazon AWS S3 bucket takeover" vulnerability scan.

To run this test, it should be possible to use the following code snippet:

it('should not contain link to missing AWS S3 bucket', async () => {
  await runner
    .createScan({
      tests: [TestType.S3_TAKEOVER]
    })
    .timeout(timeout)
    .run({
      method: 'GET',
      url: `${process.env.BROKEN_CRYSTALS_URL}`
    });
});

If the page's body contains a link that points to a 404 resource with the following content:

Code: NoSuchBucket
Message: The specified bucket does not exist
BucketName: cdn.example.com

it indicates that there is a vulnerability.

Please see the following references for more information on this vulnerability:

• Amazon S3 proofs EdOverflow/can-i-take-over-xyz#36
• https://hackerone.com/reports/918946