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Add `Skills` extension #4486

Job	Run time
checks / pre-commit	1m 7s
checks / test (3.10, locked, windows-latest)	2m 27s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 36s
checks / docs	1m 46s
checks / test (3.12, lowest-direct, windows-latest)	2m 24s
checks / test (3.10, locked, ubuntu-latest)	1m 58s
checks / test (3.10, lowest-direct, windows-latest)	2m 10s
checks / test (3.12, locked, windows-latest)	2m 21s
checks / test (3.11, locked, ubuntu-latest)	1m 43s
checks / test (3.12, locked, ubuntu-latest)	1m 14s
checks / test (3.11, lowest-direct, windows-latest)	1m 49s
checks / test (3.11, locked, windows-latest)	2m 15s
checks / test (3.13, locked, ubuntu-latest)	1m 6s
checks / test (3.13, lowest-direct, windows-latest)	2m 20s
checks / test (3.13, locked, windows-latest)	1m 19s
checks / readme-snippets	16s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.14, locked, windows-latest)	2m 18s
checks / test (3.14, locked, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.14, lowest-direct, windows-latest)	2m 47s
all-green	2s
	39m 28s