simplify CollectFields for `@defer` and `@stream` #1663

Job	Run time
Diff content of NPM package	1m 31s
Security check of added dependencies	10s
ci / Build 'denoDist' artifact	54s
ci / Build 'npmDist' artifact	1m 17s
ci / Check for commonly ignored files	5s
ci / Check health of package-lock.json file	33s
ci / Run CodeQL security scan	1m 54s
ci / Run fuzzing tests	42s
ci / Run integration tests	1m 34s
ci / Lint source files	1m 1s
ci / Run tests on Node v16	41s
ci / Run tests on Node v18	40s
ci / Build website	1m 25s
ci / Run tests on Node v19	38s
	13m 5s

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