Add Steppe and Alpine Villagers

I think Minecraft could benefit from new Villager variants adapted to different environments, especially steppe and alpine regions.

Steppe Villagers could have a nomadic lifestyle inspired by people who traditionally live across vast grasslands. They could be associated with horses, including riding and raising them, and wear clothing suited to life on the open steppe like Mongolia.

Alpine Villagers could be adapted to life in high-altitude mountain regions. Their clothing and appearance could be inspired by traditional mountain cultures from places such as the Himalayas, the Andes, and the Alps, giving them a distinct highland identity.

These Villagers would add more environmental and cultural variety to Minecraft while making different regions feel more unique and lived-in.