Adding support for DNS CAA query

[Mzack9999]

Proposed changes

This PR adds support for CAA query type in DNS protocol

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

How to reproduce

template.yaml

id: caa-example

info:
  name: CAA Example
  author: pdteam
  severity: info
  tags: dns,caa

dns:
  - name: "{{FQDN}}"
    type: CAA

    matchers:
      - type: word
        words:
          - "IN\tCAA"

    extractors:
      - type: regex
        group: 1
        regex:
          - "IN\tCAA\t(.+)"

run with:

$ echo google.com | go run . -t template.yaml 

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   2.6.0-dev

                projectdiscovery.io

[WRN] Use with caution. You are responsible for your actions.
[WRN] Developers assume no liability and are not responsible for any misuse or damage.
[INF] Using Nuclei Engine 2.6.0-dev (development)
[INF] Using Nuclei Templates 8.8.4 (latest)
[INF] Templates added in last update: 56
[INF] Templates loaded for scan: 1
[2022-02-02 07:56:33] [caa-example] [dns] [info] google.com [0 issue "pki.goog"]