Add experimental igzip #655

Job	Run time
build-wasm32-emscripten-pyodide (3.12)	2m 47s
Build sdists	16s
windows-latest-3.8-x86_64-pc-windows-msvc-x86_64	5m 0s
windows-latest-3.8-i686-pc-windows-msvc-i686	5m 0s
windows-latest-3.9-x86_64-pc-windows-msvc-x86_64	5m 2s
windows-latest-3.9-i686-pc-windows-msvc-i686	3m 38s
windows-latest-3.10-x86_64-pc-windows-msvc-x86_64	3m 47s
windows-latest-3.10-i686-pc-windows-msvc-i686	5m 3s
windows-latest-3.11-x86_64-pc-windows-msvc-x86_64	4m 26s
windows-latest-3.11-i686-pc-windows-msvc-i686	5m 3s
windows-latest-3.12-x86_64-pc-windows-msvc-x86_64	5m 2s
windows-latest-3.12-i686-pc-windows-msvc-i686	5m 2s
windows-latest-3.13-x86_64-pc-windows-msvc-x86_64	5m 1s
windows-latest-3.13-i686-pc-windows-msvc-i686	5m 1s
windows-latest-pypy3.10-x86_64-pc-windows-msvc-x86_64	5m 0s
Upload release to PyPI	1s
Publish artifacts to GH	1s
	1h 5m 10s

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