Feat support cpu affinity for eat in linux

[Tomilla]

Hi Shawn,

1 New Feature:

• Specify CPU Affinities for eat program process in Linux (Other systems still Work In Progress. As far as I know, Windows and macOS will share same Interface with Linux)

Resolved #1 Close #1

2 Introduce

Processor affinity, or CPU pinning or "cache affinity", enables the binding and unbinding of a process or a thread to a central processing unit (CPU) or a range of CPUs, so that the process or thread will execute only on the designated CPU or CPUs rather than any CPU.

3 Usage

3.1 One Full Core

Only run on first CPU Core #0

eat --cpu-affinities 0 -c 1

3.2 Multiple Full Cores

eat --cpu-affinities 0,1,2,3 -c 50%

Only run on CPU Core #4,5,6.

Notice #7 cpu affinity was declared, but not actually used by eat process.

eat --cpu-affinities 4,5,6,7 -c 3

3.3 Some Full Cores, One Part Core

// 8 cores * 0.92 = 7.36 cores ~= 7 full cores, 1 part core
eat --cpu-affinities 0,1,2,3,4,5,6,7 -c 92%

Thanks for you review 🤩

[Tomilla]

Note: due to 1.20 don't not generic and slices package. I need upgrade base golang version to 1.22 (Ref: Go 1.21 generics type inference: https://tip.golang.org/doc/go1.21#:~:text=slog.Handler%20implementations.-,New%20slices%20package,-The%20new%20slices)