* allow custom headers in upload-link endpoint
* override loader.scrape to allow for passing of headers in langchain puppeteer
* lint
* Rename some variables
move positional args to named args
update documentation to reflect arg changes and funciton sigs
validate header object before attempting to end to forward to request
* update header validation for custom headers
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Co-authored-by: timothycarambat <rambat1010@gmail.com>
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