feat: more p2g and grid sort optimizations#5
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This further optimizes the p2g transfer by sorting particles inside the block along the z-axis. This makes it more likely for full warps to only touch a 4x4x3 neighborhood instead of a full 4x4x4 chunk.
This also reduces the amount of GPU hash-map lookup by having chunks identifying and caching their neighbor chunk indices instead of doing a 2x2x2 chunk lookup from each particles.