subsys: samples: doc: arch: Make perf subsystem

[KushnerovMikhail]

Add profiling util based on periodic stack unwinding. Perf from Linux was taken as a reference.

Code is based on Sampling profiler (#29304) by @Jongy.

The operation of module is based on frame pointer usage and saving registers during interruption handling by zephyr.

General work description: The unwinding function stay in timer as expiry function so is called during interruption handling. Thus the function have access to saved registers (program counter and frame pointer in particular) of the current thread and use it to unwind the thread stack. Timer starting and results printing function are made as shell commands for conveniency. Obtained samples can be translated into flamegraph using stackcollapse.py script.

Flame graph example, generated from echo_server sample:

Kconfig optioins:

• CONFIG_PERF enables perf subsystem in compilation.
• CONFIG_PERF_BUFFER_SIZE specifies size of buffer, where samples are stored.

Kconfig requirements:

• CONFIG_THREAD_STACK_INFO=y provides start and size thread stack values.
• CONFIG_SMP=n SMP support is not implemented yet.
• CONFIG_OMIT_FRAME_POINTER=n && CONFIG_OVERRIDE_FRAME_POINTER_DEFAULT=y provide frame pointer.
• CONFIG_SHELL=y needs because subsystem provides shell commands.
• CONFIG_RISCV=y || CONFIG_X86_64=y - subsystem implemented only for x86_64 and riscv yet.

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