This method allows you to load all pages in a single call and get access to the document level
metadata of an image. It is recommended to use this method when working with PDF format since pages
inside a PDF file depend on each other, and thus, loading them at once (as a document) is preferable
to loading pages individually. If the format of an image cannot be detected, an exception is thrown.
If the document size is close to 2GB, an exception of System.OutOfMemoryException will be thrown.