… limit on macOS (pythonGH-139232)Use `pthread_get_stackaddr_np()` and `pthread_get_stacksize_np()` to determine the stack address and size.(cherry picked from commit7016044)

… stack limits (pythonGH-139294)(cherry picked from commit7094f09)

…hon#139668)Add PyUnstable_ThreadState_SetStackProtection() andPyUnstable_ThreadState_ResetStackProtection() functionsto set the stack base address and stack size of a Pythonthread state.Co-authored-by: Petr Viktorin <encukou@gmail.com>(cherry picked from commitb99db92)

…ack pointer is about to overflow the stack. (pythonGH-141711)Only raises if the stack pointer is both below the limit *and* above the stack base.This prevents false positives for user-space threads, as the stack pointer will be outside those boundsif the stack has been swapped.(cherry picked from commitc25a070)