Impl sceSystemServiceLoadExec (#3647)

* Add support for restarting the emulator with new configurations

- Implement `Restart` function in `Emulator` to enable process relaunch with updated parameters.
- Modify `sceSystemServiceLoadExec` to use the restart functionality.

* Add logging for emulator restart and system service load execution

* Add IPC emulator PID output command

Impl `PID` output command to return the emulator process ID
- required for launches supporting emulator restart

* Add log file append mode support (used after restarting to keep the same log file)

* Keep game root between restarts

* add --wait-for-debugger option flag

* add --wait-for-pid flag

used for sync between parent & child process during restart

* impl restart via ipc

* fix override game root

* add qt flags to allow restart

src/core/debugger.h

@@ -0,0 +1,16 @@
+//  SPDX-FileCopyrightText: Copyright 2025 shadPS4 Emulator Project
+//  SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+namespace Core::Debugger {
+
+bool IsDebuggerAttached();
+
+void WaitForDebuggerAttach();
+
+int GetCurrentPid();
+
+void WaitForPid(int pid);
+
+} // namespace Core::Debugger