gh-102471: Add PyLong import and export API #127

Job	Run time
Interpreter (Debug)	6m 47s
Free-Threaded (Debug)	10m 22s
i686-pc-windows-msvc/msvc (Debug)	5m 1s
i686-pc-windows-msvc/msvc (Release)	5m 44s
x86_64-pc-windows-msvc/msvc (Debug)	4m 34s
x86_64-pc-windows-msvc/msvc (Release)	5m 28s
aarch64-pc-windows-msvc/msvc (Debug)	5m 4s
aarch64-pc-windows-msvc/msvc (Release)	5m 34s
x86_64-apple-darwin/clang (Debug)	14m 1s
x86_64-apple-darwin/clang (Release)	18m 28s
aarch64-apple-darwin/clang (Debug)	9m 14s
aarch64-apple-darwin/clang (Release)	15m 37s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 58s
x86_64-unknown-linux-gnu/gcc (Release)	17m 40s
x86_64-unknown-linux-gnu/clang (Debug)	7m 52s
x86_64-unknown-linux-gnu/clang (Release)	13m 30s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 9m 20s
aarch64-unknown-linux-gnu/gcc (Release)	58m 52s
aarch64-unknown-linux-gnu/clang (Debug)	1h 3m 51s
aarch64-unknown-linux-gnu/clang (Release)	36m 16s
	6h 21m 13s

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