Deprecate DataSite.createNewItemFromPage
Deprecate DataSite.createNewItemFromPage

Added a deprecated decorator with future_warning parameter
and ImagePage.fromPage() for the instead parameter.

Bug: T98663
Change-Id: Ia074e8f44c8c349f0e2c06694ecb6c16134c54da

wikimedia/pywikibot-core,wikimedia/pywikibot-core