Run Python Tests

Add `metaformats` to README #180

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Run time

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Job	Run time
build-linux (3.8)	48s
build-windows (3.8)	1m 38s
build-linux (3.9)	53s
build-windows (3.9)	2m 27s
build-linux (3.10)	53s
build-windows (3.10)	1m 19s
build-windows (3.11)	1m 18s
build-linux (3.11)	56s
build-windows (3.12)	2m 21s
build-macos (3.8)	2m 8s
build-linux (3.12)	1m 4s
build-macos (3.9)	1m 10s
build-macos (3.10)	1m 9s
build-macos (3.11)	1m 40s
build-macos (3.12)	1m 55s
	21m 39s