simplify reflect.TypeOf calls with TypeFor #117

Job	Run time
ci / resolve-modules / resolve-modules	2s
ci / build-and-test (.)	26s
ci / lint (.)	22s
ci / generate (.)	12s
ci / build-and-test (./testing)	24s
ci / lint (./testing)	19s
ci / mod-tidy (.)	15s
ci / generate (./testing)	11s
ci / build-and-test (./cmd/cligen)	24s
ci / lint (./cmd/cligen)	29s
ci / mod-tidy (./testing)	15s
ci / build-and-test (./cmd/examples)	22s
ci / generate (./cmd/cligen)	22s
ci / lint (./cmd/examples)	27s
ci / mod-tidy (./cmd/cligen)	16s
ci / generate (./cmd/examples)	31s
ci / mod-tidy (./cmd/examples)	15s
	5m 32s

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