feat: publisher field

[rafaelalvessa]

Implements #715. This is based off, and should be merged after, #857. Unfortunately I can't set the base to fix/locale-keys because I can't push the branch to the upstream repository.

This is my first time contributing to the project, so apologies in advance if I'm not following the conventions of the project.

Implements:

• New book publisher field in database.
• Publisher field in book screen.
• Publisher field in List display.
• Add/edit publisher in book add/edit screen with auto-complete.
• Fill publisher field for books added from Open Library (when an edition with a publisher is selected in the search screen).
• Fill publisher field for books imported from Openreads CSV and Goodreads CSV (BookWyrm CSV doesn't export the publisher).
• Sort by publisher.
• Bulk edit publisher.
• Publisher field added to books exported as a CSV.

Tested:

• Adding a book manually with.
• Adding a book from Open Library.
• Editing the publisher for an existing book.
• Publisher auto-complete on app initialisation, as well as after adding and deleting books.
• Duplicating a book copies the publisher.
• Importing books from Openreads CSV, Goodreads CSV and BookWyrm CSV (the latter doesn't include a publisher field).
• Restoring from backup.
• Creating a local backup.
• Exporting books as a CSV.
• Displaying and editing books without a publisher.
• Displaying books in List with publisher only; with publisher and publication year; and with publication year only.
• Sorting by publisher, including books without a publisher (the latter are sorted by title).
• Bulk editing the publisher for one and many books.

Screenshots: