Core: Add a test suite (#9297)

Adds a test suite for testing hyprland's features with a runtime tester

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Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

hyprtester/plugin/src/globals.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <src/plugins/PluginAPI.hpp>
+
+inline HANDLE PHANDLE = nullptr;