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Add `Skills` extension (#3485) #4489

Job	Run time
checks / docs	1m 43s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 41s
checks / test (3.13, locked, windows-latest)	2m 10s
checks / test (3.12, locked, windows-latest)	2m 42s
checks / test (3.11, locked, windows-latest)	2m 16s
checks / test (3.10, locked, windows-latest)	2m 57s
checks / test (3.11, locked, ubuntu-latest)	1m 8s
checks / test (3.13, locked, ubuntu-latest)	1m 26s
checks / test (3.14, locked, windows-latest)	2m 13s
checks / readme-snippets	14s
checks / pre-commit	53s
checks / test (3.12, lowest-direct, windows-latest)	1m 54s
checks / test (3.12, locked, ubuntu-latest)	1m 20s
checks / test (3.14, locked, ubuntu-latest)	1m 30s
checks / test (3.13, lowest-direct, windows-latest)	2m 24s
checks / test (3.10, lowest-direct, windows-latest)	2m 51s
checks / test (3.14, lowest-direct, windows-latest)	2m 21s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.11, lowest-direct, windows-latest)	2m 17s
checks / test (3.10, locked, ubuntu-latest)	1m 55s
checks / test (3.11, lowest-direct, ubuntu-latest)	59s
all-green	3s
	41m 0s