test

Add `fmt` command #1833

Job	Run time
CLI responsiveness with latest Python	2m 2s
Downstream builds with Python 3.8	34s
Downstream builds with Python 3.9	43s
Downstream builds with Python 3.10	38s
Downstream builds with Python 3.11	38s
Downstream builds with Python 3.12	43s
Python 3.8 on Linux	22s
Python 3.9 on Linux	20s
Python 3.10 on Linux	19s
Python 3.11 on Linux	18s
Python 3.12 on Linux	20s
Python 3.8 on Windows	1m 7s
Python 3.9 on Windows	50s
Python 3.10 on Windows	49s
Python 3.11 on Windows	1m 19s
Python 3.12 on Windows	49s
Python 3.8 on macOS	26s
Python 3.9 on macOS	23s
Python 3.10 on macOS	24s
Python 3.11 on macOS	42s
Python 3.12 on macOS	23s
Report coverage	0s
check	3s
	14m 12s

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