Improve the documentation of profiling with "perf maps"

The documentation lives here: https://github.com/python/cpython/blob/d6cf05b5d00abbfdf9008d646c14c6ef7c83b61a/Doc/howto/perf_profiling.rst

Before #136461, cpython only had support for Linux perf profiling. But with this PR it now supports both Linux and macOS through samply. I updated the documentation to include this, but it's not super great currently because previously it was written with the assumption that it was only supported by Linux perf. So it would be good to restructure this doc in a better way, and add more information related to macOS profiling using samply.

Also samply supports both perf modes so it would be good to clarify when to use them.

cc @pablogsal @hugovk

Inizia da Doc/howto/perf_profiling.rst e rivedi le modifiche di PR #136461 per comprendere la copertura attuale di Linux perf e macOS samply. Confronta le modalità perf supportate da samply e riorganizza la guida in modo che il supporto delle piattaforme, la configurazione e la selezione della modalità siano chiari. Il lavoro è completato quando la documentazione spiega accuratamente come eseguire il profiling sia su Linux sia su macOS e quando usare ciascuna modalità.