Function writeVoxel

writeVoxel(options: WriteVoxelOptions, fs: FileSystem): Promise<void>
Voxelizes Gaussian splat data and writes the result as a sparse voxel octree.

This function performs GPU-accelerated voxelization of Gaussian splat data and outputs two files:
- filename (.voxel.json) - JSON metadata including bounds, resolution, and array sizes
- Corresponding .voxel.bin - Binary octree data (nodes + leafData as Uint32 arrays)
The binary file layout is:
- Bytes 0 to (nodeCount * 4 - 1): nodes array (Uint32, little-endian)
- Bytes (nodeCount * 4) to end: leafData array (Uint32, little-endian)
Parameters
- options: WriteVoxelOptions
  Options including filename, data, and voxelization settings.
- fs: FileSystem
  File system for writing output files.
Returns Promise<void>
Example
```
import { writeVoxel, MemoryFileSystem } from '@playcanvas/splat-transform';

const fs = new MemoryFileSystem();
await writeVoxel({
    filename: 'scene.voxel.json',
    dataTable: myDataTable,
    voxelResolution: 0.05,
    opacityCutoff: 0.5,
    createDevice: async () => myGraphicsDevice
}, fs);
```
- Defined in writers/write-voxel.ts:154