Support preserving original structure for PDF

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Preserve Original Structure for PDFs in Signatures

Previously, we attempted to recreate documents to fix errors before signing and avoid breaking signatures, or when features like document ID watermarking or a custom seal page template were required.

However, in some scenarios, the original document structure must be preserved. For example, if the signing process isn't allowed to change the document, or if the document has already been certified by a third party, recreating it would invalidate the certification.

See more at Signatures examples