Gather benchmark results for each CUB algorithm using different offset types

[jrhemstad]

In order to make an informed decision about the offset type solution, we would like to have a complete understanding of the impact on each CUB algorithm. Therefore, for each algorithm, we'd like a table that summarizes the following:

• Performance with i32, u32, i64, u64 offset type
• Verify that the algorithm still passes unit tests with this offset type
• Report box plot of performance impacts across range of data types, input sizes, etc.
  • Can be summarized in table as min/max/median

    ### Algorithms

[elstehle]

Priority-wise, I think we want to focus on the algorithms that currently do not support large number of items yet (see overview). That is,

• device_select.cuh,
• device_partition.cuh,
• device_scan.cuh,
• device_segmented_sort.cuh,
• device_segmented_radix_sort.cuh,
• device_run_length_encode.cuh