Font Library: Add all REST API endpoints. #2267

Job	Run time
Core running from build / Core running from build / Linux	2m 4s
Core running from src / Core running from src / Linux	1m 54s
Core running from build / Core running from build / Windows	3m 49s
Core running from src / Core running from src / Windows	3m 32s
Core running from build / Core running from build / MacOS	4m 20s
Gutenberg running from build / Gutenberg running from build / Linux	8m 10s
Core running from src / Core running from src / MacOS	3m 44s
Gutenberg running from src / Gutenberg running from src / Linux	8m 10s
Gutenberg running from build / Gutenberg running from build / Windows	11m 41s
Gutenberg running from src / Gutenberg running from src / Windows	11m 49s
Gutenberg running from build / Gutenberg running from build / MacOS	17m 52s
Gutenberg running from src / Gutenberg running from src / MacOS	11m 58s
Leave WordPress Playground details	3s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 29m 6s

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