ARROW-8933: [C++] Trim redundant generated code from compute/kernels/vector_hash.cc #7528
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Since hashing doesn't know the difference between int64, uint64, float64, or timestamp when it comes to performing its work, there's no need to generate identical compiled code for each of these logical types with the same underlying physical representation (64-bit values). 400KB is cut out of libarrow.so on Linux
I also trimmed vector_sort.cc a bit by using a simpler generator-dispatcher to use the same kernel Binary/String and LargeBinary/LargeString