[must have] Add longterm chunk geometry caching

[zardoy]

Cache geometry of chunks:

For servers that register chunk-cache channel do cache in IndexedDB using fs mount for cache
Otherwise cache only in variable so when moving back to the same chunk it compares the hash of chunks with blocks and maybe uses the same cache fast

[FELMONON]

Hi! I'd like to work on this bounty.

My approach:

1. Study the current chunk rendering and geometry handling in the codebase
2. Implement IndexedDB-based caching for servers that support the chunk-cache channel
3. Add in-memory hash-based caching for other servers to optimize returning to previously visited chunks
4. Ensure proper cache invalidation when chunk data changes

I'll start exploring the codebase and have a PR ready soon!