Add Favorite Books, Authors, Series, and Narrators Feature

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It would be great to have the ability to mark certain books, authors, series, or narrators as "Favorites" within Audiobookshelf. For a next level nice to have is when a new book comes out from the favorited series or whatever it could pop up on your home page.

UI/UX:

• Add a "Favorites" tab or section in the library view for easy access to favorited items.
  

• Display the favorite status through icons or highlights (e.g., a star icon).
  

• Include filters for favorites in the search and sorting options.
  

Benefits:

• Streamlines access to user-preferred content.
  

• Provides a more personalized experience.
  

• Encourages discovery of new content based on favorite authors, series, or narrators.