Add experimental igzip #661

Job	Run time
Build sdists	21s
build-wasm32-emscripten-pyodide (3.12)	3m 9s
windows-latest-3.8-x86_64-pc-windows-msvc-x86_64	6m 55s
windows-latest-3.8-i686-pc-windows-msvc-i686	5m 54s
windows-latest-3.9-x86_64-pc-windows-msvc-x86_64	7m 21s
windows-latest-3.9-i686-pc-windows-msvc-i686	6m 9s
windows-latest-3.10-x86_64-pc-windows-msvc-x86_64	7m 18s
windows-latest-3.10-i686-pc-windows-msvc-i686	6m 31s
windows-latest-3.11-x86_64-pc-windows-msvc-x86_64	4m 56s
windows-latest-3.11-i686-pc-windows-msvc-i686	4m 58s
windows-latest-3.12-x86_64-pc-windows-msvc-x86_64	6m 20s
windows-latest-3.12-i686-pc-windows-msvc-i686	4m 5s
windows-latest-3.13-x86_64-pc-windows-msvc-x86_64	7m 14s
windows-latest-3.13-i686-pc-windows-msvc-i686	8m 11s
windows-latest-pypy3.10-x86_64-pc-windows-msvc-x86_64	6m 24s
Publish artifacts to GH	0s
Upload release to PyPI	0s
	1h 25m 46s

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