[Feature Request] Support Template URLs

[pbnj-dragon]

Supporting template URLs should relatively simple to introduce.

Example:

      - name: Nuclei - Vulnerability Scan
        uses: projectdiscovery/nuclei-action@main
        with:
          target: https://example.com
          templates: https://raw.githubusercontent.com/foo/bar/main/custom-templates.yml

In index.js, something like this perhaps:

if (templates) {
  try {
    // URL() constructor will throw if a string is not URL, per https://www.rfc-editor.org/rfc/rfc3986
    new URL(templates);
    params.push(`-turl=${templates}`);
  } catch () {
    params.push(`-t=${templates}`);
  }
}

If you are OK with this, I can submit a PR.

[olearycrew]

@pbnj-dragon If you want to try and make this work, I think a PR would be great.

[pbnj-dragon]

@olearycrew - Done. Thank you.