Return pageNavigation instead of pageBreakNumbers when inferring metadata

[HadrienGardeur]

printPageNumbers has been gradually deprecated in favor of two different values:

• pageBreakMarkers which is meant to indicate that the text of the publication contains page break markers using ARIA
• and pageNavigation which is meant to indicate that the publication contains a list of pages, usually based on HTML IDs

The current inference technique is based on the presence of pageList in the RWPM output which can either come from:

• a Navigation Document in EPUB 3.x
• or an NCX in EPUB 2.x

Given the nature of what is inferred here, the toolkit should return pageNavigation instead of printPageNumbers.