LPS-34428 Move export ratings logic to LayoutExporter

Conflicts:
	portal-impl/src/com/liferay/portal/lar/LayoutExporter.java
LPS-34428 Move import ratings logic to LayoutImporter
LPS-34428 Remove the PageRatingsPortletDataHandler.

The logic for export/import has been moved to the LayoutExporter/LayoutImporter classes, respectively. The logic to delete data was already included at LayoutLocalServiceImpl#deleteLayout.
LPS-33914 Move export comments logic to LayoutExporter.

The permission export is already performed by the PortletExporter, so this logic is not necessary.
LPS-33914 Move import comments logic to LayoutImporter.

The permission import is already performed by the PortletImporter, so this logic is not necessary.
LPS-33914 Remove the PageCommentsPortletDataHandler.

The logic for export/import has been moved to the LayoutExporter/LayoutImporter classes, respectively. The logic to delete data was already included at LayoutLocalServiceImpl#deleteLayout
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