Add ability to extract outerHTML of xpath selected element

[TomKeyte]

Please describe your feature request:

Currently using an xpath extractor you have the option to select either an element or the inner text: https://github.com/projectdiscovery/nuclei/blob/dev/pkg/operators/extractors/extract.go#L87

It would be useful to have an option to extract the outerHtml. This is trivial enough using

value = htmlquery.OutputHTML(node, true)

if a template condition is met.

Describe the use case of this feature:

I would like to modify this template to be able to extract script tags that are not utilising the integrity attribute, but extract the entire elements html and not just the src or innerHTML
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/misconfiguration/missing-sri.yaml

[GeorginaReeder]

Thanks for your feature request @TomKeyte ! we'll take a look into this :)

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