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Add `Skills` extension #4474

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	43s
checks / docs	1m 21s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.10, locked, windows-latest)	3m 12s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.11, locked, windows-latest)	2m 34s
checks / test (3.10, lowest-direct, windows-latest)	2m 14s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 47s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.11, lowest-direct, windows-latest)	2m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 30s
checks / test (3.12, locked, ubuntu-latest)	1m 24s
checks / test (3.13, lowest-direct, windows-latest)	2m 12s
checks / test (3.14, locked, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	2m 36s
checks / test (3.10, locked, ubuntu-latest)	1m 57s
checks / test (3.14, lowest-direct, windows-latest)	2m 10s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.12, locked, windows-latest)	2m 16s
checks / test (3.14, locked, windows-latest)	2m 20s
checks / test (3.13, locked, ubuntu-latest)	1m 27s
checks / test (3.13, locked, windows-latest)	2m 10s
all-green	4s
	40m 32s