Add @wordpress/a11y script module #10070

Job	Run time
Core running from build / Core running from build / Linux	2m 6s
Core running from src / Core running from src / Linux	2m 0s
Core running from build / Core running from build / Windows	4m 38s
Core running from src / Core running from src / Windows	3m 24s
Core running from build / Core running from build / MacOS	1m 45s
Gutenberg running from build / Gutenberg running from build / Linux	8m 39s
Core running from src / Core running from src / MacOS	1m 59s
Gutenberg running from src / Gutenberg running from src / Linux	9m 9s
Gutenberg running from build / Gutenberg running from build / Windows	11m 48s
Gutenberg running from src / Gutenberg running from src / Windows	11m 51s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 25s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 23s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 7s

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