HTML API: Add method to create fragment at node #12021

Job	Run time
Core running from build / Core running from build / Linux	2m 12s
Core running from build / Core running from build / Windows	4m 0s
Core running from src / Core running from src / Windows	4m 24s
Core running from src / Core running from src / Linux	2m 5s
Core running from build / Core running from build / MacOS	2m 13s
Core running from src / Core running from src / MacOS	1m 58s
Gutenberg running from build / Gutenberg running from build / Linux	8m 32s
Gutenberg running from src / Gutenberg running from src / Linux	8m 31s
Gutenberg running from build / Gutenberg running from build / Windows	11m 13s
Gutenberg running from src / Gutenberg running from src / Windows	10m 49s
Gutenberg running from src / Gutenberg running from src / MacOS	10m 27s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 8s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 13m 32s

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