feat: add wappalyzer() DSL function

[Mzack9999]

Expose wappalyzergo's fingerprint engine as a DSL helper so templates can
detect technologies inline without a dedicated matcher type.

Origin: nuclei#6336.

Proposed signature:

wappalyzer(headers, body string) []string

• headers: raw HTTP header block (the {{header}} variable from http templates)
• body: response body
• returns: alphabetically-sorted list of detected technology names

Example:

contains_any(wappalyzer(header, body), "WordPress")