incremental: lazily create DeferredFragments #2083

Job	Run time
Diff content of NPM package	1m 40s
Security check of added dependencies	4s
ci / Lint source files	1m 14s
ci / Check for commonly ignored files	3s
ci / Check health of package-lock.json file	39s
ci / Run fuzzing tests	57s
ci / Run integration tests	1m 40s
ci / Build 'denoDist' artifact	46s
ci / Build 'npmDist' artifact	56s
ci / Build website	1m 32s
ci / Run CodeQL security scan	1m 26s
ci / Run tests on Node v16	52s
ci / Run tests on Node v18	40s
ci / Run tests on Node v19	46s
	13m 15s

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