improve fqdn extraction from response body using parsers

[tarunKoyalwar]

Please describe your feature request:

• currently we use regex to extract potential domains and then apply some heuristic rules
• this can furthur be improved by using actual parsers
  • html -> goquery
  • javascript -> goja ast parser (https://github.com/dop251/goja/tree/master/parser)
• parsers allow us to filter out and locate contexts and then extract fqdns from those places ( ex: src , href attributes of html , strings literals of javscript etc)

Describe the use case of this feature:

• reduced FP and FN