Custom capture script

[matteocargnelutti]

It would be convenient to allow users to pass a JavaScript function allowing for customizing the way the page is going to be captured.

const capture = await Scoop.capture(
  "https://lil.law.harvard.edu", 
  { customBehavior: () => { ... }}
)

• This function would be passed to Playwright's context via page.evaluate()
• The contents of this function should be listed in the provenance summary, for transparency purposes (?).