[Feat] Pass back raw PDF so users can implement their own parsing methods

[calebpeffer]

Problem Description For the sake of flexibility and robustness, it would be good if we passed back raw pdfs we grab as objects so people can parse them with their own methods.

Proposed Feature

Allow people to access raw pdf bytes in return, giving them the freedom to use their own parsing/conversion methods if they wish. We should also probably add an optional param to toggle this.

Customers have asked for this.

Additional Context

Reach out to BS via slack once completed @calebpeffer