Mason villagers should make ore blocks

With the cave update adding deepslate ores and changing ore distribution overall, it is the perfect opportunity to improve the stone mason villager. It should get trades where it creates ores from the basic materials (like copper ingots or lapis blocks) and maybe cobbled deepslate or cobblestone for a price of emeralds.

This would be an alternative to mining some of the ores with Silk Touch, but add the unique feature of making deepslate coal, copper and emerald ores obtainable.

Chiseling and polishing stone is much cheaper and easier to do yourself in a crafting table or stone cutter, so the stone mason would keep being a service worker, but actually offer a useful and unique service. Also, this is easy to balance by making the trade require excess material and limited to few trades per cycle.