Block Hooks: Set hooked block's layout attribute based on anchor block's #759

Job	Run time
Core running from src / Core running from src / Linux	1m 56s
Core running from build / Core running from build / Linux	2m 6s
Core running from src / Core running from src / Windows	3m 22s
Core running from src / Core running from src / MacOS	5m 42s
Core running from build / Core running from build / MacOS	4m 35s
Core running from build / Core running from build / Windows	3m 10s
Gutenberg running from src / Gutenberg running from src / Linux	7m 33s
Gutenberg running from build / Gutenberg running from build / Linux	7m 13s
Gutenberg running from build / Gutenberg running from build / Windows	8m 45s
Gutenberg running from src / Gutenberg running from src / Windows	14m 29s
Gutenberg running from build / Gutenberg running from build / MacOS	21m 45s
Gutenberg running from src / Gutenberg running from src / MacOS	19m 52s
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	1h 40m 28s

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