Add experimental igzip #660

Job	Run time
build-wasm32-emscripten-pyodide (3.12)	2m 57s
Build sdists	16s
windows-latest-3.8-x86_64-pc-windows-msvc-x86_64	4m 38s
windows-latest-3.8-i686-pc-windows-msvc-i686	5m 43s
windows-latest-3.9-x86_64-pc-windows-msvc-x86_64	3m 26s
windows-latest-3.9-i686-pc-windows-msvc-i686	4m 40s
windows-latest-3.10-x86_64-pc-windows-msvc-x86_64	4m 23s
windows-latest-3.10-i686-pc-windows-msvc-i686	5m 26s
windows-latest-3.11-x86_64-pc-windows-msvc-x86_64	3m 26s
windows-latest-3.11-i686-pc-windows-msvc-i686	6m 4s
windows-latest-3.12-x86_64-pc-windows-msvc-x86_64	3m 53s
windows-latest-3.12-i686-pc-windows-msvc-i686	5m 10s
windows-latest-3.13-x86_64-pc-windows-msvc-x86_64	4m 58s
windows-latest-3.13-i686-pc-windows-msvc-i686	6m 4s
windows-latest-pypy3.10-x86_64-pc-windows-msvc-x86_64	3m 35s
Publish artifacts to GH	0s
Upload release to PyPI	0s
	1h 4m 39s

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