fix: use std::vector for dynamically sized array in gather.cpp and segment.cpp #99
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Fixes "error C2131: expression did not evaluate to a constant" during compilation.
This error is caused by the lambda function in gather.cpp both in lines 44 to 66 and 105 to 137 using a variable length array "vals[K]". Regular C-Style Arrays need to be initialized with a constant expression that can be evaluated during compilation. Replacing this with a std::vector<scalar_t> initialized with K zeros solves the problem.