feat: nicely display CPU affinity when running benchmarks

[Arno500]

Related to [FEATURE] Improve CPU pinning reporting #49

Previously, when getting information on which CPU the benchmark was running, the string was not intelligently created, leading to really long outputs on CPUs with a lot of cores. Now, we try to be a little smarter:

• [0, 1, 2, 3, 4, 5] becomes "0-5"
• [0, 4, 2, 3, 7, 8, 9] becomes "0, 2-4, 7-9"

It should improve output readability and general UX.

[ErwanAliasr1]

"feat: nicely display CPU affinity when running benchmarks"

Please replace 'feat:' by a 'where' statement, like "hwbench:"

[ErwanAliasr1]

You could also present a real use case in your commit message.

Before the commit:
[randread_cmdline_0] fio/cmdline/cmdline(M): 6 stressor pinned on CPU [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127] for 600s

With the commit:
[randread_cmdline_0] fio/cmdline/cmdline(M): 6 stressor pinned on CPU [0-127] for 600s