Please add feature AutoPage

[NeluQi]

Add the possibility of automatic pagination. When you need to create a book with a large text, it is very inconvenient to manually split into pages.
Other plugins don't have such a feature either, if you add it, it will be a super feature

As an implementation option, make the AutoPage flag and if it is included in the yml book, if the line does not fit on the page, the text will automatically be moved to the next page