Add Optional Endgame Infinite Multiverse Dimensions Inspired by 20w14∞

I hope to add an optional infinite multiverse dimension system, inspired by the 20w14infinite April Fools dimension, while fixing its performance issues. It stays disabled by default, leaving vanilla worlds, achievements and speedrunning rules untouched. Create the Echo Soul Flint and Steel with 1 Netherite Ingot, 1 Gravel, and 7 Echo Shards. It activates portal frames of various blocks to open random portals. Portals lead to new random dimensions when rebuilt without anchors. Add the ultra-rare Dimension Archive Bookshelf, rarer than enchanted golden apples, only found in special treasure chests. It works only in alternate dimensions, creating coded Dimension Books to permanently anchor portals to specific worlds. All builds and changes in anchored worlds save persistently, marking true endgame completion beyond defeating the Ender Dragon. Three main world templates: Normal (35%), Floating Islands (40%), Deep Underground (15%), plus custom variants. Time speed is limited between 0~2.5x vanilla speed. Strict generation rules prevent laggy structures like mass floating lava, TNT+Redstone, huge leaf clusters, and mass end crystals. Unique structures and varied loot bring fresh adventures. Alternate dimension data is stored separately to avoid lag. Single players can toggle the system; servers default to disabled for balance. This design greatly extends Minecraft’s sandbox potential and longevity.