Implement isinstance/issubclass #9

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	3m 1s
i686-pc-windows-msvc/msvc (Release)	2m 21s
x86_64-pc-windows-msvc/msvc (Debug)	2m 55s
x86_64-pc-windows-msvc/msvc (Release)	2m 33s
aarch64-pc-windows-msvc/msvc (Debug)	2m 55s
aarch64-pc-windows-msvc/msvc (Release)	2m 55s
x86_64-apple-darwin/clang (Debug)	18m 7s
x86_64-apple-darwin/clang (Release)	14m 36s
aarch64-apple-darwin/clang (Debug)	8m 51s
aarch64-apple-darwin/clang (Release)	11m 50s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 3s
x86_64-unknown-linux-gnu/gcc (Release)	17m 32s
x86_64-unknown-linux-gnu/clang (Debug)	8m 59s
x86_64-unknown-linux-gnu/clang (Release)	13m 40s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 0m 16s
aarch64-unknown-linux-gnu/gcc (Release)	48m 38s
aarch64-unknown-linux-gnu/clang (Debug)	1h 0m 15s
aarch64-unknown-linux-gnu/clang (Release)	31m 18s
	5h 19m 45s

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