Add Y coordinate remapping for extended world heights

[LonghiTW]

Adds Y coordinate remapping so Bedrock players can view Java worlds outside the native Bedrock vertical range.

Changes:

• Adds a configurable vertical remap threshold.
• Keeps fake Y centered around Bedrock-safe Y 128.
• Remaps player position packets, entity spawn Y, block updates, block entities, and chunk sections.
• Sends only the visible 24 Bedrock-compatible chunk sections and fills missing sections with air.
• Restores Geyser chunk cache height metadata on login/respawn/world changes.

Note:
I verified the patch applies cleanly. On my local JDK 26, upstream Lombok 1.18.36 fails during annotation processing with ExceptionInInitializerError; using Lombok 1.18.46 in a disposable verification clone allows compileJava to complete successfully.

BTW, This is extracted from my fork GeyserExtendedWorlds, where I experimented with extended coordinate remapping for Bedrock clients. I kept this PR focused on the upstream-compatible behavior change and avoided project rename / downstream branding changes.