Deterministic pdf#523
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This is where the normalizer originated. It has since been extracted to the DeterministicPdf package and adopted by the other pdf producing repos, so the local copy is now the duplicate. The algorithm is unchanged, which the unchanged pdf snapshots confirm. The package additionally takes a defensive copy, so the caller keeps ownership of the array it passed. The tests that cover the algorithm itself now live in the package. The ones kept here are the pdfium specific wiring: that a normalized document, a FOP produced document, and a pdfium re-split page subset all still load.
Ports the SkipPdfNormalization setting from Verify.PDFium (3fd22e9). Adds a SettingsTask/VerifySettings extension backed by a context key, so a caller whose producer already emits byte-deterministic documents can snapshot the bytes as produced. Normalizing those again copies the buffer, rescans it, and — when the XMP packet is canonicalized — rebuilds it and repairs the cross-reference table, all to change nothing. Default behaviour is unchanged: without the setting the bytes are normalized. SkipPdfNormalizationTests asserts the pairing rather than just that the setting round-trips: the skipped snapshot holds the producer's own bytes and the default one holds the neutralized bytes. A premise test pins that the sample is not already normalization-invariant, so the pair cannot both pass vacuously.
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