[Model Runner V2] Simplify BlockTables with UVA#31965
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This PR simplifies the
append_block_idsmethod inBlockTablesby using UVA buffer to store the block tables.Previously, the block table was stored in GPU, and we send the "diff" to GPU every step. While efficient, this approach complicated the code quite a bit to pack the "diff"s into contiguous GPU tensors and perform async-copy for them.
Using the UVA tensor eliminates the need for such packing and async copies, at the cost of transferring the block tables from CPU to GPU every step.