Adding support for payloads in headless protocol

[Mzack9999]

Proposed changes

This PR adds support for payloads in headless protocol

id: headless-payloads

info:
  name: headless payloads example
  author: pdteam
  severity: info
  tags: headless

headless:
  - attack: clusterbomb
    payloads:
      aa:
        - aa
        - bb
      bb:
        - cc
        - dd
    steps:
      - args:
          url: "{{BaseURL}}?aa={{aa}}&bb={{bb}}"
        action: navigate
      - action: waitload
    matchers:
      - type: word
        words:
          - "test"

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)

[ehsandeep]

• Payload input from cli flag support

id: headless-payloads

info:
  name: headless payloads example
  author: pdteam
  severity: info
  tags: headless

headless:
  - steps:
      - args:
          url: "{{BaseURL}}?params={{test}}"
        action: navigate
      - action: waitload
    matchers:
      - type: word
        words:
          - "test"

./nuclei -t test.yaml -headless -u https://example.com -var test=pp.txt

done