[Suggestion] Add AutoLibrarian mod

[Miroslavhasak]

Describe the feature

Automatically trains a villager to become a librarian that sells a specific enchanted book. I pick what book and how much emeralds i want it to cost.

Before submitting a suggestion

• This feature doesn't already exist in the client. (I have checked every module and their settings on the latest dev build)

• This wasn't already suggested. (I have searched suggestions on GitHub and read the FAQ)

[Big-Iron-Cheems]

There is already an addon providing this functionality: https://github.com/maxsupermanhd/meteor-villager-roller