Add experimental igzip #656

Job	Run time
Build sdists	13s
build-wasm32-emscripten-pyodide (3.12)	2m 42s
windows-latest-3.8-x86_64-pc-windows-msvc-x86_64	3m 33s
windows-latest-3.8-i686-pc-windows-msvc-i686	5m 26s
windows-latest-3.9-x86_64-pc-windows-msvc-x86_64	5m 28s
windows-latest-3.9-i686-pc-windows-msvc-i686	3m 40s
windows-latest-3.10-x86_64-pc-windows-msvc-x86_64	5m 13s
windows-latest-3.10-i686-pc-windows-msvc-i686	4m 1s
windows-latest-3.11-x86_64-pc-windows-msvc-x86_64	5m 16s
windows-latest-3.11-i686-pc-windows-msvc-i686	6m 40s
windows-latest-3.12-x86_64-pc-windows-msvc-x86_64	4m 55s
windows-latest-3.12-i686-pc-windows-msvc-i686	5m 36s
windows-latest-3.13-x86_64-pc-windows-msvc-x86_64	5m 31s
windows-latest-3.13-i686-pc-windows-msvc-i686	5m 37s
windows-latest-pypy3.10-x86_64-pc-windows-msvc-x86_64	4m 59s
Upload release to PyPI	0s
Publish artifacts to GH	0s
	1h 8m 50s

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