Use the load interface of prismarine-chunk instead of setting attributes directly

[rom1504]

The interface is guaranteed to be stable. The internal implementation is not

[rom1504]

https://github.com/PrismarineJS/prismarine-provider-anvil/blob/master/src/1.18/chunk.js#L130 is the right way

[rom1504]

https://github.com/PrismarineJS/prismarine-chunk/blob/master/src/pc/1.18/ChunkColumn.js#L307C8-L307C8 looks like this is the actual implementation for 1.18 ; eg anvil is partially implemented in p-chunk
We need this loadSection abstraction layer but not sure it should be in pchunk

[rom1504]

So need to define a reasonable interface between pchunk and panvil and use that for all versions