[DO NOT MERGE] WIP NodeCaret RangeSelection.getNodes() #2459

Job	Run time
core-tests / integrity (20.11.0)	1m 59s
core-tests / unit (18.18.0)	1m 57s
core-tests / unit (18.18.0, beta)	2m 5s
e2e-tests / canary (ubuntu-latest, 18.18.0, chromium, rich-text, modern-events) / e2e-test	18m 10s
	24m 11s

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