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Add `Skills` extension #4477

Job	Run time
checks / pre-commit	1m 13s
checks / docs	1m 23s
checks / readme-snippets	11s
checks / test (3.14, locked, ubuntu-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.14, locked, windows-latest)	2m 16s
checks / test (3.13, locked, windows-latest)	2m 12s
checks / test (3.10, lowest-direct, windows-latest)	2m 12s
checks / test (3.11, locked, windows-latest)	2m 17s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, locked, ubuntu-latest)	1m 34s
checks / test (3.13, lowest-direct, windows-latest)	2m 22s
checks / test (3.12, locked, windows-latest)	2m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 27s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 33s
checks / test (3.11, locked, ubuntu-latest)	1m 36s
checks / test (3.10, locked, windows-latest)	2m 43s
checks / test (3.12, lowest-direct, windows-latest)	2m 27s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.10, locked, ubuntu-latest)	1m 34s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 31s
checks / test (3.13, locked, ubuntu-latest)	1m 30s
all-green	3s
	41m 24s