Refactor obj_id and id2ref to no longer be GC implementation specific #10504

Job	Run time
Windows 2019/Visual C++ 2015 (check)	45m 55s
Windows 2019/Visual C++ 2019 (check)	48m 45s
Windows 2022/Visual C++ 2019 (check)	46m 23s
Windows 2025/Visual C++ 2019 (check)	51m 44s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	59m 1s
Windows 2022/Visual C++ 2019 (test-bundled-gems)	56m 26s
Windows result	1s
	5h 8m 15s

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