[lexical-utils] Bug Fix: Add missing Flow type declarations (#6841) #1669

Job	Run time
core-tests / integrity (20.11.0)	2m 6s
core-tests / unit (18.18.0)	1m 47s
core-tests / unit (18.18.0, beta)	1m 55s
e2e-tests / canary (ubuntu-latest, 18.18.0, chromium, rich-text, modern-events) / e2e-test	13m 46s
	19m 34s

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