乒乓球游戏：C++ GDExtension 实现

main/pingpang.gdextension

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+[configuration]
+entry_symbol = "pingpang_library_init"
+compatibility_minimum = "4.5"
+
+[libraries]
+windows.x86_64 = "res://bin/pingpang.dll"
+linux.x86_64 = "res://bin/libpingpang.so"
+macos.universal = "res://bin/libpingpang.dylib"