refactor: reorganize api-related utils #41

Job	Run time
unit-test / test (ubuntu-slim, lts/*)	24s
unit-test / test (ubuntu-slim, 22)	23s
unit-test / test (windows-latest, 22)	48s
unit-test / lint	31s
unit-test / test (windows-latest, lts/*)	1m 23s
	3m 29s

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