Feature request: Merge to a fixed paper size

[frabnet]

I'm trying to merge 2 or more PDF (A5 size) in to a new PDF (A4 size).
I was wondering if it's possible to add a parameter that impose page size, for example:
Merge-PDF -InputFile $src1, $src2 -OutputFile $destination -OutputPageSize A4

[PrzemyslawKlys]

It makes sense but to achieve that:

• We need to create a function to resize any page to demanded value
• And maybe then add it as option to merge-pdf

Resources to use:

• https://stackoverflow.com/questions/56377322/how-to-scale-the-page-size-from-a3-to-a4-in-itext7-c
• https://kb.itextpdf.com/home/it7kb/examples/scaling-and-rotating-pages
• https://kb.itextpdf.com/home/it7kb/examples/changing-page-sizes-of-existing-pdfs