[EPIC] Port CUB device-scope algorithm tests to use Catch2

[jrhemstad]

Tasks

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1. Split this list up into what can be done for 2.2 vs future
2. Port CUB device-scope scan & reduce-related algorithm tests to use Catch2 #85
   4 of 4
   cub +1
   
3. Port CUB device-scope histogram and sort-related algorithm tests to use Catch2 #86
   4 of 4
   cub +1
   
4. Port CUB device-scope selection, partition, and adjacent difference algorithm tests to use Catch2 #87
   6 of 6
   cub +1
   
5. Port CUB DeviceCopy & DeviceMemcpy tests to Catch2 #1798
   0 of 2
   cub feature request infrastructure +3

[jrhemstad]

@elstehle to break this up for 2.2