Core: Add a test suite (#9297)

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

---------

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

hyprtester/src/hyprctlCompat.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <cstdint>
+
+struct SInstanceData {
+    std::string id;
+    uint64_t    time;
+    uint64_t    pid;
+    std::string wlSocket;
+    bool        valid = true;
+};
+
+std::vector<SInstanceData> instances();
+std::string                getFromSocket(const std::string& cmd);