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Implement generating trace in wgsl #2

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limited to 2^12 poseidon instances due to wgpu buffer size limit
8 packs of 158 columns are packed into the columns, which are all independent and can be parallelized
change parallelization parameters: use 256 threads per workgroup to compute the full trace for each columns first (8 workgroups are used in total since 8 independent sets of columns are repeated throughout this call)
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