Fix for new Hireling Correspondence section missing.

[DakJaniels]

feat: Add hireling correspondence sections to Lore Library

• Added function GetHirelingMessageCollection to retrieve hireling message collection data.
• Added function GetHirelingMessages to retrieve messages for a specific hireling type.
• Modified RebuildLoreLibrary to include hireling correspondence sections.
• Updated FilterScrollList to handle both lore books and hireling correspondence.
• Fixed error handling for GetHirelingMessageCollection function.
• Ensured proper display of data in the scroll list with ZO_ScrollList_Commit(self.list).