Jonas Jenwald b8ec518a1e Split the existing PDFFunction in two classes, a private PDFFunction and a public PDFFunctionFactory, and utilize the latter in PDFDocument to allow various code to access the methods of PDFFunction`
*Follow-up to PR 8909.*

This requires us to pass around `pdfFunctionFactory` to quite a lot of existing code, however I don't see another way of handling this while still guaranteeing that we can access `PDFFunction` as freely as in the old code.

Please note that the patch passes all tests locally (unit, font, reference), and I *very* much hope that we have sufficient test-coverage for the code in question to catch any typos/mistakes in the re-factoring.
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