Refactor obj_id and id2ref to no longer be GC implementation specific #10505

Job	Run time
Windows 2019/Visual C++ 2015 (check)	49m 50s
Windows 2019/Visual C++ 2019 (check)	44m 55s
Windows 2022/Visual C++ 2019 (check)	46m 34s
Windows 2025/Visual C++ 2019 (check)	55m 48s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	1h 0m 57s
Windows 2022/Visual C++ 2019 (test-bundled-gems)	45m 1s
Windows result	1s
	5h 3m 6s

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