Implement bin partitioning function #5092
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To write tiles into a temporary array that will fit into fixed-sized blocks on reading, this PR implements a bin partitioning function that returns a
std::vectorof cell partitions, such that each group of cells has a total byte count less than a specified number of bytes. Also returned is astd::vectorof the bin sizes (in number of bytes).This is the first file to go into the new sm/external_sort, so it also creates the directory and populates it with a test subdirectory and appropriate CMakeLists.txt files.
A previous PR creates a doc subdirectory and includes the svg image of our design for external sort.
[sc-48618]
TYPE: FEATURE
DESC: Implement a partitioning function to partition cells to fit into fixed size bins