Allow strict mode for PdfWriter

[stefan6419846]

Explanation

PdfWriter currently does not support strict mode out of the box due to a missing __init__ parameter, although its base class PdfDocCommon defines the value. As there are some cases where a strict mode might make sense (like some error cases in clone_reader_document_root), it should be implemented directly as well.

Code Example

How would your feature be used? (Remove this if it is not applicable.)

from pypdf import PdfReader, PdfWriter

writer = PdfWriter(clone_from="test.pdf", strict=True)