Dominoes

Changes:

• Allow "stacking" straight dominoes, causing them to split over an extra block on collapse
• Split is done using a falling domino, so it drops as an item if there's no space, and can propagate collapse down large cliffs

Full Changelog: https://github.com/sisby-folk/dominoes/compare/0.4.0+fabric-1.21.8...0.5.0+fabric-1.21.8