Add an OS.crash() method for testing system crash handler

[Calinou]

master version of #55614.

This makes it possible to test the system's crash handler without having to modify engine code or exploit an engine bug.

This will come handy for developing features such as #55565, #33505 and godotengine/godot-proposals#1896.

Preview

extends Node


func _ready():
	OS.crash("Testing crash handler.")

Results in:

ERROR: Testing crash handler.
   at: crash (core/core_bind.cpp:211)

================================================================
handle_crash: Program crashed with signal 4
Engine version: Godot Engine v4.0.dev.custom_build (ea66ea9060272d67fbf0c4264acb76a7bedfc4af)
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] /lib64/libc.so.6(+0x3d320) [0x7f3d643f0320] (??:0)
[2] core_bind::OS::crash(String const&) (/home/hugo/Documents/Git/godotengine/godot/core/core_bind.cpp:211)
[3] void call_with_ptr_args_helper<__UnexistingClass, String const&, 0ul>(__UnexistingClass*, void (__UnexistingClass::*)(String const&), void const**, IndexSequence<0ul>) (/home/hugo/Documents/Git/godotengine/godot/./core/variant/binder_common.h:244)
[4] void call_with_ptr_args<__UnexistingClass, String const&>(__UnexistingClass*, void (__UnexistingClass::*)(String const&), void const**) (/home/hugo/Documents/Git/godotengine/godot/./core/variant/binder_common.h:493)
[5] MethodBindT<String const&>::ptrcall(Object*, void const**, void*) (/home/hugo/Documents/Git/godotengine/godot/./core/object/method_bind.h:291)
[6] GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Callable::CallError&, GDScriptFunction::CallState*) (/home/hugo/Documents/Git/godotengine/godot/modules/gdscript/gdscript_vm.cpp:1869)
[7] GDScriptInstance::call(StringName const&, Variant const**, int, Callable::CallError&) (/home/hugo/Documents/Git/godotengine/godot/modules/gdscript/gdscript.cpp:1511)
[8] Node::_gdvirtual__ready_call() (/home/hugo/Documents/Git/godotengine/godot/./scene/main/node.h:236)
[9] Node::_notification(int) (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:143)
[10] Node::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/main/node.h:48)
[11] CanvasItem::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/main/canvas_item.h:?)
[12] Node2D::_notificationv(int, bool) (/home/hugo/Documents/Git/godotengine/godot/./scene/2d/node_2d.h:?)
[13] Object::notification(int, bool) (/home/hugo/Documents/Git/godotengine/godot/core/object/object.cpp:846)
[14] Node::_propagate_ready() (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:188)
[15] Node::_propagate_ready() (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:179)
[16] Node::_set_tree(SceneTree*) (/home/hugo/Documents/Git/godotengine/godot/scene/main/node.cpp:?)
[17] SceneTree::initialize() (/home/hugo/Documents/Git/godotengine/godot/scene/main/scene_tree.cpp:402)
[18] OS_LinuxBSD::run() (/home/hugo/Documents/Git/godotengine/godot/platform/linuxbsd/os_linuxbsd.cpp:?)
[19] /home/hugo/Documents/Git/godotengine/godot/bin/godot.linuxbsd.tools.64.llvm(main+0x1c6) [0x462e7f6] (/home/hugo/Documents/Git/godotengine/godot/platform/linuxbsd/godot_linuxbsd.cpp:58)
[20] /lib64/libc.so.6(__libc_start_main+0xd5) [0x7f3d643dab75] (??:0)
[21] /home/hugo/Documents/Git/godotengine/godot/bin/godot.linuxbsd.tools.64.llvm(_start+0x2e) [0x462e56e] (??:?)
-- END OF BACKTRACE --
================================================================