[pull] master from fast-pack:master - #16
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BinaryPacking using the Vector API pack/unpack kernels: each block is packed at its own maxbits with no exceptions. The maxbits computation is vectorized via an OR-reduction over the block. On Graviton4 (Neoverse V2, SVE2 128-bit), full codec round trip vs scalar BinaryPacking over 256K random ints: compress 2.5-3.0x faster across all bit widths; decompress 4.0x at low widths, tapering to 2.4x near width 31.
Add vectorized BinaryPacking int codec
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