Add default Python starter kit and release CI packaging #21

Job	Run time
Check version consistency	8s
Build CPython for WASI	14m 16s
Build sdist	2m 31s
macOS x86_64-apple-darwin	29m 22s
Linux aarch64-unknown-linux-gnu	14m 58s
macOS aarch64-apple-darwin	9m 23s
Windows x86_64	15m 2s
Linux x86_64-unknown-linux-gnu	11m 17s
Collect release artifacts	12s
Create GitHub Release	0s
	1h 37m 9s

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