This is a New In Town Addon, as such, for it to function it needs the New In Town datapack installed, install it here: https://www.planetminecraft.com/data-pack/new-in-town-a-settler-s-experience-data-pack/

This Addon adds 4 new structures with villagers:
-Hunter: trades meat for arrows
-stonesmith: gives enchanted stone tools for the start of your game
-hideworker: trades food for leather and rabbit hide
-Forager: trades food for plants and berries