Wandering traders should only spawn on certain natural blocks

Wandering traders spawn everywhere, including inside of your builds. They get in the way of the build process. Wandering traders should spawn in a nearby undeveloped area and let us decide if we want to interact with them. This can be accomplished by making them spawn only on a limited number of basic natural blocks that we can avoid using in our builds, such as grass, dirt, stone, and sand. In the real world, a salesperson does not just help themselves into your house.