Land - Standard, Lower Sides and Fully Covered Sides

Add three optional side styles for natural blocks: Default (current appearance), Lower Sides, and Fully Covered Sides. These options would be available for blocks such as grass, mycelium, dirt paths, podzol, snowy grass, crimson nylium, and warped nylium. They would create smoother and more uniform landscapes, improve block transitions, and give builders more customization options without affecting gameplay.