CAA query support

[ehsandeep]

Please describe your feature request:

Reference: https://github.com/projectdiscovery/nuclei/pull/1564

Describe the use case of this feature:

echo mta-sts.hackerone.com | dnsx -caa
mta-sts.hackerone.com

echo mta-sts.hackerone.com | dnsx -caa -resp

mta-sts.hackerone.com [digicert.com]
mta-sts.hackerone.com [letsencrypt.org]
mta-sts.hackerone.com [digicert.com]

echo mta-sts.hackerone.com | dnsx -caa -json | jq .

{
  "host": "mta-sts.hackerone.com",
  "resolver": [
    "1.0.0.1:53"
  ],
  "caa": [
    "digicert.com",
    "letsencrypt.org",
    "digicert.com"
  ],
  "has_internal_ips": false,
  "status_code": "NOERROR",
  "timestamp": "2022-03-09T20:32:11.664901+05:30"
}

More reference: https://support.dnsimple.com/articles/caa-record/#whats-a-caa-record